Perhaps you should try some spelling variations:
"molecular interaction" » "molecular detection", "molecular identification"
"molecular interactions" » "molecular detections", "molecular identifications"
"intermolecular interactions" » "intermolecular detections", "intermolecular identifications"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("molecular interaction") OR ("molecular interactions"))) OR ("intermolecular interactions")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"molecular interaction\") OR (\"molecular interactions\"))) or (\"intermolecular interactions\"))".
• Removing quotes may allow a broader search: (((( molecular interaction ) OR ( molecular interactions ))) or ( intermolecular interactions )).
• Adding a wildcard symbol may retrieve word variants: (((("molecular interaction") OR ("molecular interactions"))) or ("intermolecular interactions"))*.