Perhaps you should try some spelling variations:
"trinh giang xu snippets" » "trinh giao xu snippets", "trinh giai xu snippets", "trinh tieng xu snippets", "trinh giang xua snippets", "trinh gian xu snippets", "trinh giang qua snippets", "trinh giang xu 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 giang xu 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 giang xu snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh giang xu snippets ) or ( dung dung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh giang xu snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.