Perhaps you should try some spelling variations:
"advanced in chemistry studies" » "advanced in chemistry study", "advanced in chemical studies"
"advanced in chemistry methods" » "advanced in chemical methods", "advanced in chemistry methodology"
"advanced in chemistry ethics" » "advanced in chemistry metrics", "advanced in chemistry basics", "advanced in chemistry optics"

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