Perhaps you should try some spelling variations:
ranks » banks
grant » grants, grandt, irant, grawt
rain » brain, main, gain
grain » gbrain, gmain, ggain, brain
brainy » bbrainy, bmainy, bgainy, brain, rainy, brains
race » rate, face, rice
gran » grand, iran, graw
ggain » gain, again

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

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