Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"den thi tran snippets" » "den thi trang snippets", "den thi thanh snippets", "den thi lan snippets", "dien thi tran snippets", "de thi tran snippets", "dan thi 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 ("den thi tran snippets"))) or ("locating bug core snippets"))~.
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