Perhaps you should try some spelling variations:
chemistry studies » chemistry study
chemistry sources » chemistry courses, chemistry surfaces, chemistry force
chemistry series » chemistry species, chemistry erich, chemistry sars
chemical studies » biochemical studies, clinical studies, numerical studies
advances » advanced

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 (((chemistry studies) OR (chemical studies))))) OR (chemistry sources))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "advances in ((((chemistry series) or (((chemistry studies) OR (chemical studies))))) or (chemistry sources))*".