Perhaps you should try some spelling variations:
investment demands » investment demand, investment funds, investment trends
fixed investment » direct investment
investment does » investment data, investment assets, investment across
rate investment » rates investment, trade investment, water investment
test fixed » test field, net fixed, testing fixed
heat rate » flat rate

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