Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dung tran han slippers" » "dung tren han slippers", "hung tran han slippers", "dang tran han slippers", "dung tran hanh slippers", "dung tran hoan slippers", "dung tran nhan slippers", "dung tran han slippery", "dung tran han grippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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