Perhaps you should try some spelling variations:
ranks » banks
band » bond
grant » grants, graint, grandt, irant
grantdtd » grantsdtd, granted, graintdtd, grandtdtd, irantdtd
rain » brain, main, rail
brains » bbrains, bmains, brails, brain, grains, trains
race » rate, face, rice
gran » grain, grand, iran
ggain » grain, again, ggains, gmain
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: (((((hard or ranks) or band) or (had or land)) or (bank or bonds)) or (((((grant or rain) or (grantdtd or irantdtd)) or race) or gran) or (((ggain OR gain) or (ggain OR gain)) or brains))) counterinsurgency study ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((hard OR ranks) OR band) OR (had OR land)) OR (bank OR bonds)) OR (((((grant OR rain) OR (grantdtd OR irantdtd)) OR race) OR gran) OR (((ggain OR gain) OR (ggain OR gain)) OR brains))) counterinsurgency study ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((((hard or ranks) or band) or (had or land)) or (bank or bonds)) or (((((grant or rain) or (grantdtd or irantdtd)) or race) or gran) or (((ggain OR gain) or (ggain OR gain)) or brains))) counterinsurgency study ;".
• Adding a wildcard symbol may retrieve word variants: (((((hard or ranks) or band) or (had or land)) or (bank or bonds)) or (((((grant or rain) or (grantdtd or irantdtd)) or race) or gran) or (((ggain OR gain) or (ggain OR gain)) or brains))) counterinsurgency study ;*.