Perhaps you should try some spelling variations:
"dung luan code snippets" » "dung luan cong snippets", "dung luan che snippets", "dung luan de snippets"
"trinh do do snippets" » "trinh ky do snippets", "trinh dao do snippets", "trinh so do snippets", "trinh do bo snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets"

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

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