Perhaps you should try some spelling variations:
"tran hung san snippets" » "tran hong san snippets", "tran quang san snippets", "tran hoang san snippets", "tran nhung san snippets", "tran dung san snippets", "tran hung dan snippets", "tran hung san 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: (((("tran hung san snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tran hung san snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
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