Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"phan van tra snippets" » "pham van tra snippets", "thanh van tra snippets", "luan van tra snippets", "phan van tri snippets", "phan van tru snippets", "phan dan tra 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 ("phan van tra snippets"))) or ("locating bug core snippets"))~.
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