Perhaps you should try some spelling variations:
"advances in chemistry chemical" » "advances in chemistry physical", "advances in chemistry technical"
"advances in chemistry courses" » "advances in chemistry current"
"advances in chemistry special" » "advances in chemistry social", "advances in chemistry section", "advances in chemistry space"
"advances in chemistry africa" » "advances in chemistry metrics", "advances in chemistry after", "advances in chemistry atomic"

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