Perhaps you should try some spelling variations:
"h. heat private investment treaties" » "h. heat private investment strategies", "h. heat private investment activities", "h. heat private investment incentives", "h. net private investment treaties", "h. east private investment treaties", "h. west private investment treaties"
"h. salt rates investment barriers" » "h. salt notes investment barriers", "h. salt rules investment barriers", "h. salt water investment barriers", "h. past rates investment barriers", "h. vat rates investment barriers"

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 private investment treaties") OR ("h. salt rates investment barriers"))~.
• Removing quotes may allow a broader search: (( h. heat private investment treaties ) or ( h. salt rates investment barriers ))~.
• Adding a wildcard symbol may retrieve word variants: (("h. heat private investment treaties") or ("h. salt rates investment barriers"))*.