Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"tang duong duc snippets" » "tang cuong duc snippets", "tang dong duc snippets", "giang duong duc snippets", "tang luong duc snippets", "tang duong qua snippets", "tang dang duc 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 duong duc snippets"))) or ("locating bug core snippets"))~.
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