Perhaps you should try some spelling variations:
"trinh doan manh snippets" » "trinh toan manh snippets", "thinh doan manh snippets", "trinh dan manh snippets", "trinh doan minh snippets", "trinh hoang manh snippets", "trinh tran manh snippets", "trinh doan manh slippers"
"dung bug code snippets" » "dung dung code snippets", "dung hung code snippets", "dung rung code snippets", "dung bug code slippers", "dung bug core snippets"
"locating bug code snippets" » "locating bug code slippers", "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 doan manh 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 doan manh snippets") OR ("dung bug code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh doan manh snippets ) or ( dung bug code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh doan manh snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))*.