Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"tang cho trinh snippets" » "tang co trinh snippets", "tang tho trinh snippets", "tang cho sinh snippets", "trang cho trinh snippets", "sang cho trinh snippets", "hang cho trinh 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 ("tang cho trinh snippets"))) or ("locating bug core snippets"))~.
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