Perhaps you should try some spelling variations:
chemistry specimen » chemistry sediment, chemistry special, chemistry specific
chemistry species » chemistry special, chemistry specific, chemistry studies
chemistry series » chemistry studies, chemistry sources, chemistry sars
chemistry africa » chemistry metrics, chemistry atomic, chemistry action
chemistry spaces » chemistry space, chemistry snakes, chemistry stacey
chemistry erich » chemistry metrics, chemistry ethics, chemistry eco

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 series\") or (\"advances in ((chemistry erich) OR (chemistry africa))\"))) or (\"advances in ((((chemistry species) OR (chemistry spaces))) OR (chemistry specimen))\"))".
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((((\\"advances in chemistry series\\") or (\\"advances in ((chemistry erich) OR (chemistry africa))\\"))) or (\\"advances in ((((chemistry species) or (chemistry spaces))) or (chemistry specimen))\\"))\"".
• Removing quotes may allow a broader search: (((( advances in chemistry series ) or ( advances in ((chemistry erich) OR (chemistry africa)) ))) or ( advances in ((((chemistry species) or (chemistry spaces))) or (chemistry specimen)) )).