Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"trinh tren thi snippets" » "trinh truyen thi snippets", "trinh tuyen thi snippets", "trinh tieng thi snippets", "trinh trien thi snippets", "trinh tran thi snippets", "trinh trieu thi 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 ("trinh tren thi snippets"))) or ("locating bug core snippets"))~.
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