Perhaps you should try some spelling variations:
rca » rcac, rcga, rica
orca » orcac, orcga, orica, ohca, orta, urca
orcad » orcacd, orcgad, oricad, ohcad, ortad, urcad
dorca » dorcac, dorcga, dorica, dohca, dorta, durca, dorra, dora
arca » arcac, arcga, arica, area, arc, arce
roca » rocca, rocha, boca
ortad » orta

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 orca) OR roca) OR orcad) OR dorca) OR arca) OR ortad) estimation algorithm~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "modified ((((((rca OR orca) OR roca) OR orcad) OR dorca) OR arca) OR ortad) estimation algorithm".
• Adding a wildcard symbol may retrieve word variants: modified ((((((rca OR orca) OR roca) OR orcad) OR dorca) OR arca) OR ortad) estimation algorithm*.