Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"duc van tran snippets" » "duc van trang snippets", "duc van tranh snippets", "duc van tuan snippets", "duc va tran snippets", "duc tan tran snippets", "duc manh tran snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("python using java snippets") or ("duc van tran snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("duc van tran snippets"))) OR ("locating bug core snippets")).
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