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