Perhaps you should try some spelling variations:
rank » ranks, frank
band » bond
gran » grain, iran, gray
grand » graind, irand, grayd, brand
grant » graint, irant, grayt, grants
rain » brain, gain, rail
graind » gbraind, ggaind, graild, grained, grain, grains
graw » grow, draw, grew
graft » draft, craft, kraft
ani » anti, anil

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