Perhaps you should try some spelling variations:
viable » variable
eviable » evariable, evitable, evitables, inviable
revisable » previsible
revisables » previsibles, evitables
evariable » variable, variables
vita » vista, via, vida
vital » vistal, vial, vidal
vistal » vista, vistas, nistal

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((viable or (((eviable OR revisable) or evariable) or revisables)) or ((vita or vital) or vistal)).~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((viable OR (((eviable OR revisable) OR evariable) OR revisables)) OR ((vita OR vital) OR vistal))..
• The words AND, OR and NOT may confuse the search; try adding quotes: "((viable or (((eviable OR revisable) or evariable) or revisables)) or ((vita or vital) or vistal)).".
• Adding a wildcard symbol may retrieve word variants: ((viable or (((eviable OR revisable) or evariable) or revisables)) or ((vita or vital) or vistal)).*.