Perhaps you should try some spelling variations:
"advances in chemistry courses" » "advances in chemistry current"
"advances in chemistry species" » "advances in chemistry specimen", "advances in chemistry special", "advances in chemistry series"
"advances in chemistry ethics" » "advances in chemistry metrics", "advances in chemistry methods", "advances in chemistry optics"
"advances in chemistry basics" » "advances in chemistry basic", "advances in chemistry physics", "advances in chemistry based"

Try widening your search to All Fields.

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 courses") OR ((("advances in chemistry ethics") OR ("advances in chemistry basics"))))) OR ("advances in chemistry species")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"advances in chemistry courses\") or (((\"advances in chemistry ethics\") OR (\"advances in chemistry basics\"))))) or (\"advances in chemistry species\"))".
• Removing quotes may allow a broader search: (((( advances in chemistry courses ) or ((( advances in chemistry ethics ) OR ( advances in chemistry basics ))))) or ( advances in chemistry species )).
• Adding a wildcard symbol may retrieve word variants: (((("advances in chemistry courses") or ((("advances in chemistry ethics") OR ("advances in chemistry basics"))))) or ("advances in chemistry species"))*.