Perhaps you should try some spelling variations:
"trinh hoi lieu snippets" » "trinh hoa lieu snippets", "trinh do lieu snippets", "trinh han lieu snippets", "trinh ho lieu snippets", "trinh hoi hieu snippets", "trinh hoi tieu snippets", "trinh hoi lieu 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 hoi lieu 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 hoi lieu snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh hoi lieu snippets ) or ( dung dung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh hoi lieu snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.