Perhaps you should try some spelling variations:
rca » arca, rcga, rica
rcac » arcac, rcgac, ricac, cac, rac, rcc
orca » oarca, orcga, orica, dorca, orcad, arca
aorcac » aoarcac, aorcgac, aoricac, aocac, aorac, aorcc, adorcac, aorcadc, aarcac
oarcad » oaarcad, oarcgad, oaricad, orcad
roca » rocca, rocha, boca

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

• Performing a fuzzy search may retrieve terms with similar spellings: modified (((((rca or roca) or ohca) or (rcac or orca)) or aorcac) or oarcad) estimation algorithm~.
• If you are trying to use Boolean operators, they must be ALL CAPS: modified (((((rca OR roca) OR ohca) OR (rcac OR orca)) OR aorcac) OR oarcad) estimation algorithm.
• Adding a wildcard symbol may retrieve word variants: modified (((((rca or roca) or ohca) or (rcac or orca)) or aorcac) or oarcad) estimation algorithm*.