Perhaps you should try some spelling variations:
"locating bugs code snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"dan hoc toc snippets" » "van hoc toc snippets", "dan toc toc snippets", "dai hoc toc snippets", "dan hoc hoc snippets", "dan hoc thuoc snippets", "dan hoc toeic snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dan hoc toc snippets") or ("python using java snippets"))) or ("locating bugs code snippets"))~.
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