Perhaps you should try some spelling variations:
chemistry species » chemistry specimen, chemistry special, chemistry series
chemistry sources » chemistry courses, chemistry surfaces, chemistry force
chemistry studies » chemistry study, chemical studies

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 species ) OR ((( advances in chemistry sources ) OR ( advances in chemistry studies )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( advances in chemistry species ) or ((( advances in chemistry sources ) OR ( advances in chemistry studies ))))".
• Adding a wildcard symbol may retrieve word variants: (( advances in chemistry species ) or ((( advances in chemistry sources ) OR ( advances in chemistry studies ))))*.