Perhaps you should try some spelling variations:
"dung doi de snippets" » "huong doi de snippets", "dung tai de snippets", "dung co de snippets", "dung doi deu snippets", "dung dai de snippets", "dung moi de snippets"
"nong thon code snippets" » "nong thong code snippets", "nong than code snippets", "nong thoi code snippets", "nong thon core snippets"
"locating bug code snippets" » "locating bug core snippets", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung doi de snippets") or ("nong thon code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung doi de snippets") OR ("nong thon code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung doi de snippets ) or ( nong thon code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung doi de snippets") or ("nong thon code snippets"))) or ("locating bug code snippets"))*.