Perhaps you should try some spelling variations:
waste optimization » rate optimization, wave optimization, wise optimization
case optimization » cache optimization, phase optimization, code optimization
base optimization » based optimization, phase optimization, basic optimization

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: chemical industry / ((((waste optimization) OR (case optimization))) OR (base optimization)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "chemical industry / ((((waste optimization) OR (case optimization))) or (base optimization))".
• Adding a wildcard symbol may retrieve word variants: chemical industry / ((((waste optimization) OR (case optimization))) or (base optimization))*.