Perhaps you should try some spelling variations:
investment treaties » investment strategies, investment activities, investment incentives
adjustment period » adjustment policy, adjustment operations
fixed investment » direct investment
how adjustment » flow adjustment, work adjustment, cost adjustment
test fixed » test field, net fixed, testing fixed
test how » west how, tested how, trust how

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 treaties ) or ( h. test how adjustment period ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( h. test fixed investment treaties ) OR ( h. test how adjustment period )).
• Adding a wildcard symbol may retrieve word variants: (( h. test fixed investment treaties ) or ( h. test how adjustment period ))*.