Perhaps you should try some spelling variations:
grank » frank, grand, rank
grace » grade, grate, gface, grice
race » rate, face, rice
grant » grants
graw » grow, raw, draw
brain » bmain, bgain, brail
rain » main, gain, rail
grain » gmain, ggain, grail
gmain » main, gain, smain

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((((band OR ((hand OR hard) OR bank)) OR (had OR land)) OR (bond OR bonds)) OR ((((grank OR gbandtd) OR (grace OR race)) OR (grant OR graw)) OR ((brain OR rain) OR (grain OR gmain)))) counterinsurgency study ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((band or ((hand or hard) or bank)) or (had or land)) or (bond or bonds)) or ((((grank or gbandtd) or (grace or race)) or (grant or graw)) or ((brain or rain) or (grain OR gmain)))) counterinsurgency study ;~".
• Adding a wildcard symbol may retrieve word variants: ((((band or ((hand or hard) or bank)) or (had or land)) or (bond or bonds)) or ((((grank or gbandtd) or (grace or race)) or (grant or graw)) or ((brain or rain) or (grain OR gmain)))) counterinsurgency study ;*.