Perhaps you should try some spelling variations:
"trinh luan code snippets" » "trinh luat code snippets", "trinh quan code snippets", "trinh han code snippets", "trinh luan cong snippets", "trinh luan che snippets", "trinh luan de snippets", "trinh luan code slippers"
"dung bug code snippets" » "dung dung code snippets", "dung hung code snippets", "dung rung code snippets", "dung bug code slippers"
"locating bug code snippets" » "locating bug code slippers"

Try widening your search to All Fields.

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