Perhaps you should try some spelling variations:
"dung tri nganh snippets" » "dung tri ngan snippets", "dung trien nganh snippets", "dung tai ngan snippets", "dung tai nganh snippets", "dung tren nganh snippets", "nhung tri nganh snippets", "dung tri nganh 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: (((("dung tri nganh snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung tri nganh snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung tri nganh snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.