Perhaps you should try some spelling variations:
viable » variable
inviables » invariables, inviable, invisibles, viables
inevitables » inevitable, inestables, ineviables, inevidables, inevilables
revisable » previsible
vita » via, vida, vila
vital » vial, vidal, vilal
vista » visto
vistas » vistos, revistas

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: ((viable OR ((inevitables OR inviables) OR revisable)) OR (((vita OR vista) OR vital) OR vistas)).~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((viable or ((inevitables or inviables) or revisable)) or (((vita OR vista) or vital) or vistas)).~".
• Adding a wildcard symbol may retrieve word variants: ((viable or ((inevitables or inviables) or revisable)) or (((vita OR vista) or vital) or vistas)).*.