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

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 ( model factors )))).
• Adding a wildcard symbol may retrieve word variants: (( de facto ) or ((( de factores ) or ( model factors ))))*.