Perhaps you should try some spelling variations:
"dung nhung code snippets" » "dung chung code snippets", "dung nhan code snippets", "dung trung code snippets", "dung nhung cong snippets", "dung nhung con snippets", "dung nhung code slippers"
"dong san code snippets" » "cong san code snippets", "dong bang code snippets", "dong von code snippets", "dong san co snippets", "dong san cong snippets", "dong san 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: (((("dung nhung code snippets") or ("dong san code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung nhung code snippets") OR ("dong san code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung nhung code snippets ) or ( dong san code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung nhung code snippets") or ("dong san code snippets"))) or ("locating bug code snippets"))*.