Perhaps you should try some spelling variations:
investment demands » investment demand, investment funds, investment banks
fixed investment » direct investment
rates investment » notes investment, water investment, related investment
investment does » investment codes, investment flows, investment costs
test fixed » net fixed, testing fixed
heat rates » heat rate, death rates, heat waves

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 fixed investment does ) or ( h. heat rates investment demands ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( h. test fixed investment does ) OR ( h. heat rates investment demands ))*.