Perhaps you should try some spelling variations:
"studies politics linguistica" » "studies politics linguistic", "studies geopolitics linguistic", "studies phonetics linguistics", "studies political linguistica", "states politics linguistica", "student politics linguistica"
"studie politica statistica" » "studie political statistics", "studie dominica statistical", "studie policies statistical", "studies political statistica", "saude politica statistica", "studie politik statistica"
"studie politica linguistica" » "studies political linguistica", "saude politica linguistica", "studie politik linguistica"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("studie politica linguistica") OR ("studies politics linguistica"))) OR ("studie politica statistica")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"studie politica linguistica\") OR (\"studies politics linguistica\"))) or (\"studie politica statistica\"))".
• Removing quotes may allow a broader search: (((( studie politica linguistica ) OR ( studies politics linguistica ))) or ( studie politica statistica )).
• Adding a wildcard symbol may retrieve word variants: (((("studie politica linguistica") OR ("studies politics linguistica"))) or ("studie politica statistica"))*.