Perhaps you should try some spelling variations:
"costs during studie _ filosofia de literatura" » "costs during studies _ filosofia de literatura", "costs during study _ filosofia de literatura", "costs during soldier _ filosofia de literatura", "costs during studie _ filosofia de litterature", "costs during studie _ filosofia la literatura", "costs during studie _ filosofia y literatura", "costs during studie _ filosofia del literatura"
"costs using studie _ filosofia de literatura" » "costs using studie _ filosofia de litterature", "costs using studie _ filosofia la literatura", "costs using studie _ filosofia y literatura", "costs using studie _ filosofia del literatura", "costs using studio _ filosofia de literatura", "costs using rstudio _ filosofia de literatura", "costs using study _ filosofia de literatura", "hosts using studie _ filosofia de literatura", "posts using studie _ filosofia de literatura", "tests using studie _ filosofia de literatura"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"costs during studie _ filosofia de literatura\") OR (\"costs using studie _ filosofia de literatura\"))".
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