Perhaps you should try some spelling variations:
recursions » recessions, recursos, excursions, recursives, recursoss
reversions » recessions, reversing, versions, aversions, diversions
revisions » revision, provisions, decisions
recursion » recursive, recursos
reversion » version, aversion, diversion
recession » regression

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((recursions or (reversions OR revisions)) or ((recursion or reversion) or recession))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((recursions OR (reversions OR revisions)) OR ((recursion OR reversion) OR recession)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((recursions or (reversions OR revisions)) or ((recursion or reversion) or recession))".
• Adding a wildcard symbol may retrieve word variants: ((recursions or (reversions OR revisions)) or ((recursion or reversion) or recession))*.