Perhaps you should try some spelling variations:
chemistry proceedings » theory proceedings, geometry proceedings, century proceedings
surgery proceedings » summary proceedings, surveys proceedings, neurosurgery proceedings
seminar proceedings » criminal proceedings, china proceedings
environmental » environment

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: "((surgery proceedings) OR (((seminar proceedings) OR (chemistry proceedings)))) in earth AND environmental (sciences" or science").
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((surgery proceedings) or (((seminar proceedings) OR (chemistry proceedings)))) in earth and environmental (sciences\" or science\")".
• Removing quotes may allow a broader search: ((surgery proceedings) or (((seminar proceedings) OR (chemistry proceedings)))) in earth and environmental (sciences or science ).
• Adding a wildcard symbol may retrieve word variants: "((surgery proceedings) or (((seminar proceedings) OR (chemistry proceedings)))) in earth and environmental (sciences" or science")*.