Perhaps you should try some spelling variations:
"trinh thi trac snippets" » "trinh tai trac snippets", "trinh thiet trac snippets", "trinh tu trac snippets", "trinh thi tran snippets", "trinh thi tac snippets", "trinh thi trang snippets", "trinh thi trac slippers"
"dung hung code snippets" » "dung chung code snippets", "dung nhung code snippets", "dung huong code snippets", "dung hung 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 thi trac snippets") or ("dung hung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh thi trac snippets") OR ("dung hung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh thi trac snippets ) or ( dung hung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh thi trac snippets") or ("dung hung code snippets"))) or ("locating bug code snippets"))*.