Perhaps you should try some spelling variations:
foreign patents » foreign patent, foreign agents, foreign parts
foreign parent » foreign patent, foreign talent, foreign agent
costs current » forests current, assets current, robots current

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: ((((foreign corrupt) OR (((foreign parent) OR (foreign patents))))) OR (costs current)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((foreign corrupt) or (((foreign parent) OR (foreign patents))))) or (costs current))".
• Adding a wildcard symbol may retrieve word variants: ((((foreign corrupt) or (((foreign parent) OR (foreign patents))))) or (costs current))*.