Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"trinh chon tao snippets" » "trinh cho tao snippets", "trinh con tao snippets", "trinh chuong tao snippets", "trinh che tao snippets", "trinh cho dao snippets", "trinh nhan tao 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 chon tao snippets"))) or ("locating bug core snippets"))~.
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