Perhaps you should try some spelling variations:
investment operations » investment options, investment corporation, investment regulations
rates investment » notes investment, water investment, related investment
water payment » late payment, wage payment, rate payment
melt rates » heat rates, melt water
dept water » deep water, melt water

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( h. melt rates investment operations ) or ( h. dept water payment (services OR series) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( h. melt rates investment operations ) OR ( h. dept water payment (services OR series) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( h. melt rates investment operations ) or ( h. dept water payment (services OR series) ))".
• Adding a wildcard symbol may retrieve word variants: (( h. melt rates investment operations ) or ( h. dept water payment (services OR series) ))*.