Perhaps you should try some spelling variations:
"trinh quoc con snippets" » "trinh quan con snippets", "chinh quoc con snippets", "trinh doc con snippets", "trinh quoc cong snippets", "trinh quoc son snippets", "trinh quoc co snippets"
"dung bug code snippets" » "dung dung code snippets", "dung hung code snippets", "dung rung code snippets", "dung bug core snippets"
"locating bug code snippets" » "locating bug core snippets"

Try widening your search to All Fields.

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