Perhaps you should try some spelling variations:
rca » arca, rcac, rcga
orca » oarca, orcac, orcga, orcad, arca, orta
dorca » doarca, dorcac, dorcga, dorcad, darca, dorta, dorra, dora
aorca » aoarca, aorcac, aorcga, aorcad, aarca, aorta, arca
urcad » uarcad, urcacd, urcgad, orcad, urca
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 (orca or dorca)) or aorca) or urcad) estimation algorithm~.
• If you are trying to use Boolean operators, they must be ALL CAPS: modified (((((rca OR roca) OR ohca) OR (orca OR dorca)) OR aorca) OR urcad) estimation algorithm.
• Adding a wildcard symbol may retrieve word variants: modified (((((rca or roca) or ohca) or (orca or dorca)) or aorca) or urcad) estimation algorithm*.