diff --git a/docs/example_ectd2.ipynb b/docs/example_ectd2.ipynb
index 8c00df5f..4916ab3f 100644
--- a/docs/example_ectd2.ipynb
+++ b/docs/example_ectd2.ipynb
@@ -172,11 +172,6 @@
     "To include the upper CTOC sections that include search results:"
    ]
   },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": []
-  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -207,7 +202,7 @@
    },
    "outputs": [],
    "source": [
-    "print(\"\\n\".join(ctoc.find_section_given_words([\"REMS\",\"isE\"], outfmt='tree')))"
+    "print(\"\\n\".join(ctoc.find_section_given_words(words=[\"REMS\",\"isE\"], outfmt='tree')))"
    ]
   },
   {
diff --git a/mtbp3/health/ectd.py b/mtbp3/health/ectd.py
index e5ed1022..2e91b199 100644
--- a/mtbp3/health/ectd.py
+++ b/mtbp3/health/ectd.py
@@ -48,12 +48,17 @@ def show_ctoc_tree(self, module=None, to_right=False):
         return tree.list_tree(to_right=to_right)
 
     def find_section_given_words(self, words, outfmt='simple', include='up', to_right=False):
-        if not isinstance(words, str) or not words:
-            raise ValueError("str must be a nonempty string")
+        if isinstance(words, str) and words:
+            words = [words]
+        elif isinstance(words, list) and len(words)>0:
+            assert all(isinstance(word, str) for word in words), "Elements in the list must be strings"
+        else:
+            raise ValueError("words must be a string or a list")
+        
         if include not in ['up', 'both']:
             raise ValueError("Invalid value for include. Supported values are 'up' and 'both'.")
 
-        out = [row for row in self.ctoc if words.lower() in row.lower()]
+        out = [row for row in self.ctoc if any(word.lower() in row.lower() for word in words)]
         if outfmt == 'simple':
             return out
         elif outfmt == 'tree':
diff --git a/tests/test_health_ectd.py b/tests/test_health_ectd.py
new file mode 100644
index 00000000..ff27cfb7
--- /dev/null
+++ b/tests/test_health_ectd.py
@@ -0,0 +1,32 @@
+import unittest
+from mtbp3.health.ectd import ctoc_by_fda
+
+class TestCtocByFDA(unittest.TestCase):
+
+    def setUp(self):
+        self.ctoc = ctoc_by_fda(ectd_version="3.2.2", ctoc_version="2.3.3")
+
+    def test_load_list(self):
+        self.assertIsInstance(self.ctoc.ctoc, list)
+        self.assertGreater(len(self.ctoc.ctoc), 0)
+
+    def test_show_ctoc_tree(self):
+        tree = self.ctoc.show_ctoc_tree(module=1, to_right=False)
+        self.assertIsInstance(tree[0], str)
+        self.assertGreater(len(tree), 0)
+
+    def test_find_section_given_words(self):
+        result = self.ctoc.find_section_given_words("REMS", outfmt='simple', include='up', to_right=False)
+        self.assertIsInstance(result, list)
+        self.assertGreater(len(result), 0)
+
+    def test_find_section_given_words_invalid_include(self):
+        with self.assertRaises(ValueError):
+            self.ctoc.find_section_given_words("REMS", outfmt='simple', include='invalid', to_right=False)
+
+    def test_find_section_given_words_invalid_outfmt(self):
+        with self.assertRaises(ValueError):
+            self.ctoc.find_section_given_words("REMS", outfmt='invalid', include='up', to_right=False)
+
+if __name__ == "__main__":
+    unittest.main()
\ No newline at end of file
diff --git a/tests/test_emt.py b/tests/test_health_emt.py
similarity index 100%
rename from tests/test_emt.py
rename to tests/test_health_emt.py