Perhaps you should try some spelling variations:
variable » variables
vialle » viallet, valle, viable
equivalent » equivalente, equivalentes, equivalencia
vitales » viales, vidales, vilales
vita » via, vida, vila
vital » vial, vidal, vilal
vista » visto
vistal » vistol, vistas, nistal, visbal

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((variable or ((vialle or vitales) or equivalent)) or (((vita OR vista) or vital) or vistal)).~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((variable OR ((vialle OR vitales) OR equivalent)) OR (((vita OR vista) OR vital) OR vistal)).*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((variable or ((vialle or vitales) or equivalent)) or (((vita OR vista) or vital) or vistal)).*".