Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"van cua toan snippets" » "van cua code snippets", "van cuu toan snippets", "van xuan toan snippets", "van cua thanh snippets", "vang cua toan snippets", "ban cua toan snippets", "dan cua toan 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 cua toan snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
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