Perhaps you should try some spelling variations:
ranks » banks
graind » grained, grain, grains, gmaind, graild
granttd » granted, grantttd, grainttd, grandttd
grace » grade, race
gran » grant, grain, grand
graw » grow, raw, draw
brain » bmain, brail
rain » main, rail
gain » gains, main

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((((ranks or bank) or band) or (had or land)) or (bond or bonds)) or (((((graind OR gmaind) or granttd) or grace) or (gran or graw)) or ((brain or (rain or gain)) or gbmain))) counterinsurgency study ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((ranks OR bank) OR band) OR (had OR land)) OR (bond OR bonds)) OR (((((graind OR gmaind) OR granttd) OR grace) OR (gran OR graw)) OR ((brain OR (rain OR gain)) OR gbmain))) counterinsurgency study ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((((ranks or bank) or band) or (had or land)) or (bond or bonds)) or (((((graind OR gmaind) or granttd) or grace) or (gran or graw)) or ((brain or (rain or gain)) or gbmain))) counterinsurgency study ;".
• Adding a wildcard symbol may retrieve word variants: (((((ranks or bank) or band) or (had or land)) or (bond or bonds)) or (((((graind OR gmaind) or granttd) or grace) or (gran or graw)) or ((brain or (rain or gain)) or gbmain))) counterinsurgency study ;*.