Perhaps you should try some spelling variations:
"trinh cong code snippets" » "trinh dung code snippets", "trinh cong cong snippets", "trinh cong co snippets", "trinh cong che snippets", "trinh cong code slippers"
"tang luan code snippets" » "dung luan code snippets", "tang luan cong snippets", "tang luan che snippets", "tang luan de snippets", "tang luan 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.

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

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