Perhaps you should try some spelling variations:
rand » brand, band, hand
grand » gbrand, gband, ghand, graind, irand, grawd, brand
graint » geraint, grain, grains, gmaint, ggaint, grailt
grant » graint, irant, grawt
gran » grain, iran, graw
grants » graints, irants, grawts, migrants
drains » drain, grains, trains, dmains, dgains, drails
brain » bmain, bgain, brail
rain » main, gain, rail
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 graint) or raytd) or ray) or (gran OR grand)) or ((grant or graint) or (drains or (brain or rain)))) or (((ggaint 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 graint) OR raytd) OR ray) OR (gran OR grand)) OR ((grant OR graint) OR (drains OR (brain OR rain)))) OR (((ggaint 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 graint) or raytd) or ray) or (gran OR grand)) or ((grant or graint) or (drains or (brain or rain)))) or (((ggaint 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 graint) or raytd) or ray) or (gran OR grand)) or ((grant or graint) or (drains or (brain or rain)))) or (((ggaint or grants) or rank) or raw))) counterinsurgency study ;*.