Perhaps you should try some spelling variations:
rank » ranks, frank, bank
band » bank
bond » bonds
grayd » gray, grad
grant » grants
rain » brain, main, gain
grand » brand
graw » draw, grew
tmains » trains, tmain, tgains
mains » main, gains, rains

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((((rank or hand) or hard) or (had or land)) or (band or bond)) or ((((((grayd or grant) or rain) or grayttd) or (grow or raw)) or (grand or graw)) or (tmains OR mains))) counterinsurgency study ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((rank OR hand) OR hard) OR (had OR land)) OR (band OR bond)) OR ((((((grayd OR grant) OR rain) OR grayttd) OR (grow OR raw)) OR (grand OR graw)) OR (tmains OR mains))) counterinsurgency study ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((((rank or hand) or hard) or (had or land)) or (band or bond)) or ((((((grayd or grant) or rain) or grayttd) or (grow or raw)) or (grand or graw)) or (tmains OR mains))) counterinsurgency study ;".
• Adding a wildcard symbol may retrieve word variants: (((((rank or hand) or hard) or (had or land)) or (band or bond)) or ((((((grayd or grant) or rain) or grayttd) or (grow or raw)) or (grand or graw)) or (tmains OR mains))) counterinsurgency study ;*.