Perhaps you should try some spelling variations:
recursions » recursos, excursions, recursives, reversions, recursoss
recessions » regressions
reversions » reversion, perversions, reversing
revisions » revision, provisions, decisions
recursion » recursive, reversion, recursos
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 recessions) or (reversions OR revisions)) or (recursion or recession))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((recursions OR recessions) OR (reversions OR revisions)) OR (recursion OR recession)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((recursions or recessions) or (reversions OR revisions)) or (recursion or recession))".
• Adding a wildcard symbol may retrieve word variants: (((recursions or recessions) or (reversions OR revisions)) or (recursion or recession))*.