Perhaps you should try some spelling variations:
rank » frank
ranks » franks, banks
granktd » gfranktd
sand » stand, band, san
hand » band, hard
grain » brain, gbrain, gmain, ggain
rate » rates
grand » grant, brand
brains » brain, grains, trains, bbrains, bmains, bgains
raint » saint, rainy, rains, braint, maint, gaint
rain » brain, main, gain

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: ((((((rank OR ranks) OR sand) OR hand) OR (had OR land)) OR (bank OR bonds)) OR (((((grain OR granted) OR granktd) OR rate) OR (grand OR grow)) OR (((brains OR bmaint) OR raint) OR rain))) counterinsurgency study ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((rank OR ranks) or sand) or hand) or (had or land)) or (bank or bonds)) or (((((grain or granted) or granktd) or rate) or (grand or grow)) or (((brains or bmaint) or raint) or rain))) counterinsurgency study ;~".
• Adding a wildcard symbol may retrieve word variants: ((((((rank OR ranks) or sand) or hand) or (had or land)) or (bank or bonds)) or (((((grain or granted) or granktd) or rate) or (grand or grow)) or (((brains or bmaint) or raint) or rain))) counterinsurgency study ;*.