Perhaps you should try some spelling variations:
investment treaties » investment strategies, investment activities, investment incentives
better investment » sector investments, term investment, estate investment
investment series » investment services, investment barriers, investment schemes
heat sector » meat sector, health sector, heating sector
melt better » get better, eat better, help better

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. heat sector investment series ) OR ( h. melt better investment treaties ))~.
• Adding a wildcard symbol may retrieve word variants: (( h. heat sector investment series ) or ( h. melt better investment treaties ))*.