Perhaps you should try some spelling variations:
"advances in chemistry sources" » "advances in chemistry courses", "advances in chemistry surfaces", "advances in chemistry studies"
"Advances in chemical studies" » "Advances in biochemical studies", "Advances in biblical studies"
"advances in clinical studies" » "advances in empirical studies"

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 chemical studies") OR ("Advances in classical studies"))) OR ("advances in clinical studies"))) OR ("advances in chemistry sources")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"Advances in chemical studies\") OR (\"Advances in classical studies\"))) or (\"advances in clinical studies\"))) or (\"advances in chemistry sources\"))".
• Removing quotes may allow a broader search: (((((( Advances in chemical studies ) OR ( Advances in classical studies ))) or ( advances in clinical studies ))) or ( advances in chemistry sources )).
• Adding a wildcard symbol may retrieve word variants: (((((("Advances in chemical studies") OR ("Advances in classical studies"))) or ("advances in clinical studies"))) or ("advances in chemistry sources"))*.