Update server.py

server.py

@@ -139,7 +139,7 @@ for k, v in entity_raw_name.items():
     #chemical_mesh:c050048
     tp = k.split('_')[0]
     v = capitalize_the_first_letter(v)
-    if len(v) <= 2:
+    if len(v) <= 4:
         continue
     if tp == 'chemical':
         drug_dict[v] = k