Perhaps you should try some spelling variations:
investment treaties » investment strategies, investment activities, investment incentives
fixed investment » direct investment
debt investment » direct investment, direct investments, forest investment
test fixed » test field, net fixed, testing fixed
test debt » net debt, test der, past debt
funds » fund

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( h. test fixed investment funds ) or ( h. test debt investment treaties ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( h. test fixed investment funds ) OR ( h. test debt investment treaties ))*.