Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"luan thuc trac snippets" » "dan thuc trac snippets", "nhan thuc trac snippets", "toan thuc trac snippets", "luan thuc trang snippets", "luan thuoc tram snippets", "luan thuc thuc 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 ("luan thuc trac snippets"))) or ("locating bug core snippets"))~.
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