Perhaps you should try some spelling variations:
"truan doi thang snippets" » "truyen doi thang snippets", "quan doi thang snippets", "khuan doi thang snippets", "truan doi khang snippets", "truan dai thang snippets", "truan noi thang snippets", "truan doi thang 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: (((("truan doi thang snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("truan doi thang snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("truan doi thang snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.