Perhaps you should try some spelling variations:
"tong luan cong snippets" » "tang luan cong snippets", "hang luan cong snippets", "tong luat cong snippets", "tong luong cong snippets", "tong luan chung snippets"
"dung luan code snippets" » "dung luan che snippets", "dung luan de snippets"
"locating bug code snippets" » "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: (((("tong luan cong snippets") or ("dung luan code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tong luan cong snippets") OR ("dung luan code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tong luan cong snippets ) or ( dung luan code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tong luan cong snippets") or ("dung luan code snippets"))) or ("locating bug code snippets"))*.