Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets"
"dung muon toi snippets" » "cung muon toi snippets", "dung nguon toi snippets", "dung huong toi snippets", "dung muon noi snippets", "dung vuon toi snippets", "dung muong troi snippets"
"locating bug code snippets" » "locating bug core snippets", "locating bung code snippets", "locating bugs 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 muon toi snippets"))) or ("locating bug code snippets"))~.
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