Perhaps you should try some spelling variations:
"advances in chemistry specimen" » "advances in chemistry sediment", "advances in chemistry special", "advances in chemistry specific"
"advances in chemistry courses" » "advances in chemistry current"
"advances in chemistry species" » "advances in chemistry special", "advances in chemistry series", "advances in chemistry spaces"
"advances in chemistry africa" » "advances in chemistry metrics", "advances in chemistry after", "advances in chemistry atomic"
"advances in chemistry erich" » "advances in chemistry metrics", "advances in chemistry ethics", "advances in chemistry series"

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