Perhaps you should try some spelling variations:
rank » ranks, frank, bank
band » bank, bond
graind » grained, grain, grand, ggaind, graild
grains » grain, ggains, grails
grant » grants, graint, grandt, irant
grave » gravel, grade, grace
gran » grain, grand, iran
rain » gain, rail
brain » bgain, brail

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 hard) or (had or land)) or (band or bonds)) or (((((((graind OR grains) or grant) or ggaind) or grawtssstd) or (grave or raw)) or gran) or ((rain or brain) or main))) counterinsurgency study ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((rank OR hard) OR (had OR land)) OR (band OR bonds)) OR (((((((graind OR grains) OR grant) OR ggaind) OR grawtssstd) OR (grave OR raw)) OR gran) OR ((rain OR brain) OR main))) counterinsurgency study ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((rank or hard) or (had or land)) or (band or bonds)) or (((((((graind OR grains) or grant) or ggaind) or grawtssstd) or (grave or raw)) or gran) or ((rain or brain) or main))) counterinsurgency study ;".
• Adding a wildcard symbol may retrieve word variants: ((((rank or hard) or (had or land)) or (band or bonds)) or (((((((graind OR grains) or grant) or ggaind) or grawtssstd) or (grave or raw)) or gran) or ((rain or brain) or main))) counterinsurgency study ;*.