Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"bac viet trinh snippets" » "bac viet trung snippets", "bac viet thanh snippets", "bac viet trong snippets", "hoc viet trinh snippets", "mai viet trinh snippets", "dao viet 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 ("bac viet trinh snippets"))) or ("locating bug core snippets"))~.
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