Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dung le trong slippers" » "dung le trung slippers", "dung ly trong slippers", "dung le tang slippers", "dung len trong slippers", "dung he trong slippers", "dung de trong slippers", "dung le trong slippery", "dung le trong grippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung le trong slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung le trong slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung le trong slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung le trong slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.