Perhaps you should try some spelling variations:
"model factors" » "models factors", "model factor", "model factory", "model factrs", "model factsrs"
"de factores" » "de actores", "que factores", "de sectores", "de factres", "de factsres"
"mode factor" » "model factor", "models factor", "model factory", "mode factr", "mode factsr"
"de facto" » "de fact", "de facts"

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: (("de facto") OR ((("de factores") OR ((("mode factor") OR ("model factors")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"de facto\") or (((\"de factores\") or (((\"mode factor\") OR (\"model factors\"))))))".
• Removing quotes may allow a broader search: (( de facto ) or ((( de factores ) or ((( mode factor ) OR ( model factors )))))).
• Adding a wildcard symbol may retrieve word variants: (("de facto") or ((("de factores") or ((("mode factor") OR ("model factors"))))))*.