Perhaps you should try some spelling variations:
"parton model" » "carton model", "parten model", "darton model", "partn model", "pardon model"
"parton modelo" » "carton modelo", "parten modelo", "darton modelo", "parton modelos", "partn modelo", "pardon modelo"
"barton model" » "burton model", "bartok model", "carton model"
"parto model" » "parte model", "part model", "pardo model"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((((("parton model") OR ("barton model"))) OR ("parton modelo"))) OR ("parto model"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"parton model\") OR (\"barton model\"))) OR (\"parton modelo\"))) OR (\"parto model\"))".
• Removing quotes may allow a broader search: (((((( parton model ) OR ( barton model ))) OR ( parton modelo ))) OR ( parto model )).
• Adding a wildcard symbol may retrieve word variants: (((((("parton model") OR ("barton model"))) OR ("parton modelo"))) OR ("parto model"))*.