Perhaps you should try some spelling variations:
"trinh cua nuoc snippets" » "tinh cua nuoc snippets", "trinh luat nuoc snippets", "trinh quan nuoc snippets", "trinh cua quoc snippets", "trinh cua nguoi snippets", "trinh cua thuoc snippets", "trinh cua nuoc slippers"
"dung cac code snippets" » "luong cac code snippets", "dung cho code snippets", "dung tai code snippets", "dung cac cong snippets", "dung cac co snippets", "dung cac che snippets", "dung cac 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 cua nuoc snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh cua nuoc snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh cua nuoc snippets ) or ( dung cac code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh cua nuoc snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.