Search and relevance by document name and content

Hello ,

I want to make a search using lucene and having sorting by relevance amongs the document name and its content .
When I gather hits in TopDocs like :

Code:

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QueryParser parserC = new QueryParser(Version.LUCENE_30, "contents", new StandardAnalyzer(Version.LUCENE_30));
        QueryParser parserN = new QueryParser(Version.LUCENE_30, "filename", new StandardAnalyzer(Version.LUCENE_30));
        QueryParser parserP = new QueryParser(Version.LUCENE_30, "fullpath", new StandardAnalyzer(Version.LUCENE_30))

 Query queryC = parserC.parse(q);
        Query queryN = parserN.parse(q);
        Query queryP = parserP.parse(q);

 TopDocs hits = is.search(queryC, 10);
            hits = is.search(queryN, 10);
            hits = is.search(queryP, 10);

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The content of hits is replaced everytime and its value is is.search(queryP, 10)
Is there any method (like add or something or even a collector) to store all the results in one TopDocs hit and make a sort by relevance .


Thank you .

ps : excuse me for my very bad english .