Perhaps you should try some spelling variations:
"dung dan thiet snippets" » "dung luan thiet snippets", "dung toan thiet snippets", "dung doan thien snippets", "dung dat thiet snippets", "dung san thiet snippets", "tung dan thiet snippets", "dung dan thiet slippers"
"using a code snippets" » "using a core snippets", "using a code slippers"
"locating bug code snippets" » "locating bug core snippets", "locating bug code slippers", "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: (((("using a code snippets") or ("dung dan thiet snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using a code snippets") OR ("dung dan thiet snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("using a code snippets") or ("dung dan thiet snippets"))) or ("locating bug code snippets"))*.