Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"dan trinh khoi snippets" » "dan trinh hoi snippets", "dan trinh khoa snippets", "dan trinh khai snippets", "dan tinh khoi snippets", "van trinh khoi snippets", "hanh trinh khoi 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 ("dan trinh khoi snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("dan trinh khoi snippets"))) OR ("locating bug core snippets")).
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