Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"ton kho trac snippets" » "ton pho trach snippets", "ton hoi trac snippets", "ton thi trac snippets", "toan khoa trac snippets", "von khoa trac snippets", "con khoa trac snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("ton kho trac snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ton kho trac snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
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