Perhaps you should try some spelling variations:
entr » entry, entro, ent
entra » entrya, entroa, enta, entry, extra, intra
entre » entrye, entroe, ente, entry
entroou » entryoou, entrooou, entoou, entrou
extracao » extracto, extractado, extractor

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((entr OR entra) OR extracao) OR (entre OR entroou))'acted.
• Adding a wildcard symbol may retrieve word variants: (((entr or entra) or extracao) or (entre or entroou))'acted*.