Perhaps you should try some spelling variations:
chemistry specimen » chemistry species, chemistry sediment, chemistry special
chemistry spaces » chemistry space, chemistry species, chemistry stacey
chemistry snakes » chemistry space, chemistry state, chemistry sars

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 spaces) OR (chemistry snakes)) ) OR ( advances in chemistry specimen ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( advances in ((chemistry spaces) OR (chemistry snakes)) ) or ( advances in chemistry specimen ))*".