Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"van toan toc snippets" » "van toan code snippets", "van tuan toc snippets", "van tan toc snippets", "van thanh toc snippets", "van toan hoc snippets", "van toan toi snippets", "van toan quoc snippets"
"python using java snippets" » "python using data snippets"

Try widening your search to All Fields.

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