Perhaps you should try some spelling variations:
investment demand » investor demand
fixed investment » direct investment
investment trust » investment trusts, investment treaty, investment targets
weak investment » road investment, debt investment, best investment
test weak » test beam, test web, testing weak

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

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