Perhaps you should try some spelling variations:
recursos » precursors
precursor » precursors
reversions » reversion, perversions, reversing
revisions » revision, provisions, decisions
recursion » recursions, recursive, reversion
aversion » version
recession » regression

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: (((recursos OR precursor) OR (reversions OR revisions)) OR ((recursion OR aversion) OR recession))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((recursos OR precursor) or (reversions or revisions)) or ((recursion or aversion) or recession))~".
• Adding a wildcard symbol may retrieve word variants: (((recursos OR precursor) or (reversions or revisions)) or ((recursion or aversion) or recession))*.