Perhaps you should try some spelling variations:
sand » stand, band, san
ranks » banks
frans » franz, trans, fran
grants » migrants
rand » brand, grand, band
irand » ibrand, igrand, iband, brand, iran, grand
migrates » migrate, migrated, migrants
ggain » again, ggains
gain » gains
grain » rain

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((((sand or (rank or ranks)) or (frank or frans)) or had) or land) or bank) or ((((grants or rand) or (irand or migrates)) or (ggain OR gain)) or (grain or (main or brain)))) counterinsurgency study ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((((sand OR (rank OR ranks)) OR (frank OR frans)) OR had) OR land) OR bank) OR ((((grants OR rand) OR (irand OR migrates)) OR (ggain OR gain)) OR (grain OR (main OR brain)))) counterinsurgency study ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((sand or (rank or ranks)) or (frank or frans)) or had) or land) or bank) or ((((grants or rand) or (irand or migrates)) or (ggain OR gain)) or (grain or (main or brain)))) counterinsurgency study ;".
• Adding a wildcard symbol may retrieve word variants: ((((((sand or (rank or ranks)) or (frank or frans)) or had) or land) or bank) or ((((grants or rand) or (irand or migrates)) or (ggain OR gain)) or (grain or (main or brain)))) counterinsurgency study ;*.