Perhaps you should try some spelling variations:
"trinh cac model snippets" » "trinh cau model snippets", "trinh chat model snippets", "trinh chao model snippets", "trinh cad model snippets", "trinh face model snippets", "trinh a model snippets"
"dung va code snippets" » "dung va core snippets"
"locating bug code snippets" » "locating bug core 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: (((("trinh cac model snippets") or ("dung va code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh cac model snippets") OR ("dung va code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh cac model snippets ) or ( dung va code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh cac model snippets") or ("dung va code snippets"))) or ("locating bug code snippets"))*.