Perhaps you should try some spelling variations:
investment demand » investor demand
fixed investment » direct investment
work investment » world investment, weak investment, core investment
investment ties » investment series, investment trends, investment trust
test work » best work, past work, just work

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 work investment ties ) or ( h. net fixed investment demand ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( h. test work investment ties ) OR ( h. net fixed investment demand )).
• Adding a wildcard symbol may retrieve word variants: (( h. test work investment ties ) or ( h. net fixed investment demand ))*.