Perhaps you should try some spelling variations:
rca » arca, roca, rcac
orca » oarca, oroca, orcac, ohca, arca, orta
orcad » oarcad, orocad, orcacd, ohcad, arcad, ortad
dorca » doarca, doroca, dorcac, dohca, darca, dorta, dorra, dora
aorca » aoarca, aoroca, aorcac, aohca, aarca, aorta, arca
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 orcad) OR dorca) OR aorca) OR ortad) estimation algorithm~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "modified (((((rca OR orca) OR orcad) OR dorca) OR aorca) OR ortad) estimation algorithm".
• Adding a wildcard symbol may retrieve word variants: modified (((((rca OR orca) OR orcad) OR dorca) OR aorca) OR ortad) estimation algorithm*.