Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"dung quang may snippets" » "dang quang may snippets", "luong quang may snippets", "dung luan may snippets", "dung quang tay snippets", "dung quang ma snippets", "dung quang manh snippets"
"locating bug core snippets" » "locating bug code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("using java code snippets") or ("dung quang may snippets"))) or ("locating bug core snippets"))~.
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