Perhaps you should try some spelling variations:
"nuoc cua code snippets" » "nuoc luan code snippets", "nuoc va code snippets", "hoc cua code snippets", "nuoc cua cong snippets", "nuoc cua co snippets", "nuoc cfd code snippets", "nuoc cua code 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: (((("nuoc cua code snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nuoc cua code snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nuoc cua code snippets ) or ( dung cac code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nuoc cua code snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.