Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"dap quang tran snippets" » "dap quang tuan snippets", "dap quang trung snippets", "dap quang thanh snippets", "dat quang tran snippets", "dau quang tran snippets", "dan quang tran 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 ("dap quang tran snippets"))) or ("locating bug core snippets"))~.
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