PDF full text search does not find the text

Many times when I search in the Zotero PDF-reader it does not find the text, even if the file is indexed. For instance, I copy text from another PDF-reader and paste it in Zotero, because I want to copy a nice formatted text. For instance, I search for "supra 233". Zotero doesn't find it. When I take the space away and search on "supra233" it finds it (I search without the double quotes). When I copy the same text from Zotero it is with a space. Other PDF-readers find the text without problem. For instance PDF XCHANGE. Is there a setting in Zotero that I can change or some plug in that I can use to improve the search?

Many thanks in advance,
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