Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"trinh van long snippets" » "trinh han long snippets", "trinh quan long snippets", "trinh toan long snippets", "trinh van luong snippets", "trinh van dong snippets", "trinh van cong 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 ("trinh van long snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("trinh van long snippets"))) OR ("locating bug core snippets")).
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