Perhaps you should try some spelling variations:
"trinh duc si snippets" » "tinh duc si snippets", "trinh doc si snippets", "trinh dung si snippets", "trinh duoc si snippets", "trinh duc sy snippets", "trinh duc so snippets", "trinh duc si 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 duc si 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 duc si snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh duc si snippets ) or ( dung dung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh duc si snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.