Perhaps you should try some spelling variations:
rank » frank
ranks » franks, banks
graind » grained, grain, grains
irand » brand, iran, grand
race » rate, face, rice
grandtd » grantdtd, graindtd, granddtd
gran » grant, grain, grand
gain » gains, main
gbrain » brain, grain

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((((rank OR ranks) or bank) or hard) or (had or land)) or (bond or bonds)) or (((((graind or irand) or grandtd) or race) or (gran or grow)) or ((bmaint or gain) or (gbrain or gbrain)))) counterinsurgency study ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((((rank OR ranks) OR bank) OR hard) OR (had OR land)) OR (bond OR bonds)) OR (((((graind OR irand) OR grandtd) OR race) OR (gran OR grow)) OR ((bmaint OR gain) OR (gbrain OR gbrain)))) counterinsurgency study ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((rank OR ranks) or bank) or hard) or (had or land)) or (bond or bonds)) or (((((graind or irand) or grandtd) or race) or (gran or grow)) or ((bmaint or gain) or (gbrain or gbrain)))) counterinsurgency study ;".
• Adding a wildcard symbol may retrieve word variants: ((((((rank OR ranks) or bank) or hard) or (had or land)) or (bond or bonds)) or (((((graind or irand) or grandtd) or race) or (gran or grow)) or ((bmaint or gain) or (gbrain or gbrain)))) counterinsurgency study ;*.