Perhaps you should try some spelling variations:
"trinh cua bi snippets" » "tinh cua bi snippets", "trinh luat bi snippets", "trinh quan bi snippets", "trinh cua bo snippets", "trinh cua vi snippets", "trinh cua ba snippets", "trinh cua bi slippers"
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets", "dung dung code slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("trinh cua bi snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh cua bi snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh cua bi snippets ) or ( dung dung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh cua bi snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.