Perhaps you should try some spelling variations:
chemistry specimen » chemistry species, chemistry sediment, chemistry experiment
chemistry specific » chemistry specificity, chemistry species, chemistry scientific
chemistry sources » chemistry courses, chemistry surfaces, chemistry studies
chemistry special » chemistry social, chemistry chemical, chemistry section
chemistry erich » chemistry metrics, chemistry africa, chemistry ethics
chemistry sars » chemistry sets, chemistry spps, chemistry sr

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