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 chemistry space" » "Advances in chemistry some", "Advances in chemistry simple"

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