Perhaps you should try some spelling variations:
"phung hoc phi snippets" » "phung ho phi snippets", "chung hoc phi snippets", "khung hoc phi snippets", "phung hoc pho snippets", "phung hoc chi snippets", "phung hoc khi snippets", "phung hoc phi slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("phung hoc phi snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phung hoc phi snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("phung hoc phi snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.