Perhaps you should try some spelling variations:
investment treaties » investment strategies, investment activities, investment incentives
investment demand » investment bank, investment fund, investor demand
fixed investment » direct investment
heat sector » meat sector, health sector, heating sector
kept fixed » net fixed

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( h. kept fixed investment treaties ) or ( h. heat sector investment demand ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( h. kept fixed investment treaties ) OR ( h. heat sector investment demand )).
• Adding a wildcard symbol may retrieve word variants: (( h. kept fixed investment treaties ) or ( h. heat sector investment demand ))*.