Perhaps you should try some spelling variations:
"molecular interactions" » "molecular detections", "molecular identifications"
"molecular interaction" » "molecular detection", "molecular identification"
"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 interactions") OR ("molecular interaction"))) OR ("intermolecular interactions")).
• Removing quotes may allow a broader search: (((( molecular interactions ) or ( molecular interaction ))) or ( intermolecular interactions )).
• Adding a wildcard symbol may retrieve word variants: (((("molecular interactions") or ("molecular interaction"))) or ("intermolecular interactions"))*.