Perhaps you should try some spelling variations:
"h. government sector investment period" » "h. government support investment period", "h. government action investment period", "h. government structure investment period", "h. government sector investment series", "h. government sector investment policy", "h. government sector investment demand"
"h. among ports investment flows" » "h. among port investments flows", "h. among forest investment flows", "h. among does investment flows", "h. among ports investment funds"

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. government sector investment period") OR ("h. among ports investment flows"))~.
• Removing quotes may allow a broader search: (( h. government sector investment period ) or ( h. among ports investment flows ))~.
• Adding a wildcard symbol may retrieve word variants: (("h. government sector investment period") or ("h. among ports investment flows"))*.