Perhaps you should try some spelling variations:
investment treaties » investment strategies, investment activities, investment incentives
investment treaty » investment trusts, investment targets, investment tax
trade investment » private investment, estate investment, trade adjustment
debt foreign » net foreign, den foreign, des foreign
kent trade » net trade, best trade, nest trade

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: (( h. debt foreign investment treaty ) OR ( h. kent trade investment treaties ))~.
• Adding a wildcard symbol may retrieve word variants: (( h. debt foreign investment treaty ) or ( h. kent trade investment treaties ))*.