Perhaps you should try some spelling variations:
sand » san
gravint » gradient
iraqi » iraq
rai » rail, rain, ravi
grain » grailn, grainn, gravin, brain, rain
rank » ranks, frank, bank
hand » hard
band » bank, bond
gran » grant, iran, gray
grand » grantd, irand, grayd, grant, brand
graw » draw, grew

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: ((((((((sand OR stand) OR (((iron OR (grow OR raw)) OR gravint) OR (iron OR (iraqi OR rai)))) OR had) OR rank) OR hand) OR land) OR band) OR (trans OR (((gran OR graw) OR grand) OR grain))) counterinsurgency study ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((sand or stand) or (((iron or (grow or raw)) or gravint) or (iron or (iraqi or rai)))) or had) or rank) or hand) or land) or band) or (trans or (((gran OR graw) or grand) or grain))) counterinsurgency study ;~".
• Adding a wildcard symbol may retrieve word variants: ((((((((sand or stand) or (((iron or (grow or raw)) or gravint) or (iron or (iraqi or rai)))) or had) or rank) or hand) or land) or band) or (trans or (((gran OR graw) or grand) or grain))) counterinsurgency study ;*.