Perhaps you should try some spelling variations:
"trinh anh trac snippets" » "trinh hanh trac snippets", "trinh thanh trac snippets", "trinh kinh trac snippets", "trinh sinh trac snippets", "trinh anh tuan snippets", "trinh anh thuc snippets", "trinh anh trac slippers"
"dung cong code snippets" » "dung trong code snippets", "dung cong cong snippets", "dung cong co snippets", "dung cong che snippets", "dung cong 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 anh trac snippets") or ("dung cong code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh anh trac snippets") OR ("dung cong code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh anh trac snippets ) or ( dung cong code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh anh trac snippets") or ("dung cong code snippets"))) or ("locating bug code snippets"))*.