Perhaps you should try some spelling variations:
rand » brand, grand, band
gray » ray, graw
grant » graint, grandt, irant
gran » grain, grand, iran
grants » graints, grandts, irants, migrants
brains » grains, drains, rains, bmains, bgains, brails
trains » grains, tmains, tgains, trails
brain » bmain, bgain, brail
rain » main, gain, rail
graint » gmaint, ggaint, grailt, geraint, grain, grains
rank » ranks, frank

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((rand or (hard or had)) or (bank or land)) or (((((grant or raytd) or gray) or gran) or (grant or ((brains OR trains) or (brain or rain)))) or (((graint or grants) or rank) or raw))) counterinsurgency study ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((rand OR (hard OR had)) OR (bank OR land)) OR (((((grant OR raytd) OR gray) OR gran) OR (grant OR ((brains OR trains) OR (brain OR rain)))) OR (((graint OR grants) OR rank) OR raw))) counterinsurgency study ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((rand or (hard or had)) or (bank or land)) or (((((grant or raytd) or gray) or gran) or (grant or ((brains OR trains) or (brain or rain)))) or (((graint or grants) or rank) or raw))) counterinsurgency study ;".
• Adding a wildcard symbol may retrieve word variants: (((rand or (hard or had)) or (bank or land)) or (((((grant or raytd) or gray) or gran) or (grant or ((brains OR trains) or (brain or rain)))) or (((graint or grants) or rank) or raw))) counterinsurgency study ;*.