Perhaps you should try some spelling variations:
"trinh quan lieu snippets" » "tinh quang lieu snippets", "trinh luat lieu snippets", "trinh han lieu snippets", "trinh quang lien snippets", "trinh quang dieu snippets", "trinh quan li snippets", "trinh quan 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 quan 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 quan lieu snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh quan lieu snippets ) or ( dung dung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh quan lieu snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.