Perhaps you should try some spelling variations:
"dung nhan code snippets" » "dung nhan co snippets", "dung nhan con snippets", "dung nhan code slippers"
"dung luan data snippets" » "dung luat dat snippets", "dung luan dac snippets", "dung luan danh snippets", "dung luan data slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung nhan code snippets") or ("dung luan data snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung nhan code snippets") OR ("dung luan data snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung nhan code snippets ) or ( dung luan data snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung nhan code snippets") or ("dung luan data snippets"))) or ("locating bug code snippets"))*.