Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"khan toan va snippets" » "khanh toan va snippets", "khan than va snippets", "thanh toan va snippets", "khan doan va snippets", "khan tran van snippets", "khan toan ban snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("khan toan va snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
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