Perhaps you should try some spelling variations:
grand » grant, brand, grantd, graind, irand
hand » band, hard
gran » grant, grain, iran
irand » brand, iran, rand
ggained » gained, grained, regained, agained
ggain » gain, grain, again
rain » main, gain, rail
brain » bmain, bgain, brail
graint » gmaint, ggaint, grailt, geraint, grant, grain
bgain » gain, again, bain
irani » iran, iraqi, rani

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((grand or (hand or had)) or (bank or land)) or ((((grawttd or grid) or gran) or (irand or (ggained or (ggain or (rain or (brain or bgain)))))) or ((graint or irani) or raw))) counterinsurgency study ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((grand OR (hand OR had)) OR (bank OR land)) OR ((((grawttd OR grid) OR gran) OR (irand OR (ggained OR (ggain OR (rain OR (brain OR bgain)))))) OR ((graint OR irani) OR raw))) counterinsurgency study ;.
• Adding a wildcard symbol may retrieve word variants: (((grand or (hand or had)) or (bank or land)) or ((((grawttd or grid) or gran) or (irand or (ggained or (ggain or (rain or (brain or bgain)))))) or ((graint or irani) or raw))) counterinsurgency study ;*.