Perhaps you should try some spelling variations:
commercial crops » commercial credit, commercial banks, commercial farms
based incentives » market incentives, based initiatives
gaze studies » case studies, care studies, gene studies
game studies » case studies, scale studies, ripe studies
act based » fact based, ict based, aet based

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((commercial crops) OR (commercial code)) act based incentives ((gaze studies) or (game studies)).~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((commercial crops) OR (commercial code)) act based incentives ((gaze studies) OR (game studies)).*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((commercial crops) OR (commercial code)) act based incentives ((gaze studies) or (game studies)).*".