Perhaps you should try some spelling variations:
government services » government securities
investment treaties » investment strategies, investment activities, investment incentives
foreign government » foreign investment
debt foreign » net foreign, direct foreign, daesh foreign
test private » cost private, net private, costs private

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( h. debt foreign government services ) or ( h. test private investment treaties ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( h. debt foreign government services ) OR ( h. test private investment treaties )).
• Adding a wildcard symbol may retrieve word variants: (( h. debt foreign government services ) or ( h. test private investment treaties ))*.