Perhaps you should try some spelling variations:
investment demands » investment demand, investment funds, investment trends
fixed investment » direct investment
investment flows » investment funds
water investment » water investments, after investment, rates investment
test fixed » test field, net fixed, testing fixed
melt water » salt water

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. test fixed investment flows ) OR ( h. melt water investment demands ))~.
• Adding a wildcard symbol may retrieve word variants: (( h. test fixed investment flows ) or ( h. melt water investment demands ))*.