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

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 specimen")).
• Removing quotes may allow a broader search: (((( advances in chemistry courses ) or ( advances in chemistry erich ))) 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 specimen"))*.