Perhaps you should try some spelling variations:
"trinh toan duan snippets" » "tinh toan duan snippets", "thanh toan duan snippets", "trinh han duan snippets", "trinh toan quan snippets", "trinh toan luan snippets", "trinh toan doanh snippets"
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets"
"locating bug core snippets" » "locating bug 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 toan duan snippets") or ("dung dung code snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh toan duan snippets") OR ("dung dung code snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( trinh toan duan snippets ) or ( dung dung code snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh toan duan snippets") or ("dung dung code snippets"))) or ("locating bug core snippets"))*.