Perhaps you should try some spelling variations:
"dung cac hoan snippets" » "dung cac khoan snippets", "dung cach hoan snippets", "dung cac hoat snippets", "luong cac hoan snippets", "dung cho hoan snippets", "dung tai hoan snippets"
"using a code snippets" » "using a 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: (((("using a code snippets") or ("dung cac hoan snippets"))) or ("locating bug code snippets"))~.
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