Perhaps you should try some spelling variations:
"Advances in chemistry studies" » "Advances in chemistry study", "Advances in chemical studies"
"advances in chemistry sources" » "advances in chemistry courses", "advances in chemistry surfaces", "advances in chemistry force"

Try widening your search to All Fields.

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: (("Advances in chemistry studies") OR ("advances in chemistry sources")).
• Removing quotes may allow a broader search: (( Advances in chemistry studies ) or ( advances in chemistry sources )).
• Adding a wildcard symbol may retrieve word variants: (("Advances in chemistry studies") or ("advances in chemistry sources"))*.