Perhaps you should try some spelling variations:
rca » orca, rcac, rcga
arca » aorca, arcac, arcga, area, arc, arce
darca » daorca, darcac, darcga, darea, darc, darce, darcy, daria, dorca
aorcad » aoorcad, aorcacd, aorcgad, orcad
arcacd » aorcacd, arcaccd, arcgacd, areacd, arccd, arcecd
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 (arca or darca)) or aorcad) or arcacd) estimation algorithm~.
• If you are trying to use Boolean operators, they must be ALL CAPS: modified (((((rca OR roca) OR ohca) OR (arca OR darca)) OR aorcad) OR arcacd) estimation algorithm.
• Adding a wildcard symbol may retrieve word variants: modified (((((rca or roca) or ohca) or (arca or darca)) or aorcad) or arcacd) estimation algorithm*.