Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"dung pham phap snippets" » "dung phan phap snippets", "hung pham phap snippets", "tung pham phap snippets", "dung kham pha snippets", "dung phap phan snippets", "dung pham nhat 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 ("dung pham phap snippets"))) or ("locating bug core snippets"))~.
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