Perhaps you should try some spelling variations:
"trinh toan da snippets" » "tinh toan da snippets", "thanh toan da snippets", "trinh han da snippets", "trinh toan dam snippets", "trinh toan dai snippets", "trinh toan dau snippets"
"dung ung code snippets" » "dung trung code snippets", "dung quang code snippets", "dung chung code snippets", "dung ung co snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung ung code snippets") or ("trinh toan da snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung ung code snippets") OR ("trinh toan da snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung ung code snippets") or ("trinh toan da snippets"))) or ("locating bug code snippets"))*.