Perhaps you should try some spelling variations:
"trinh thuc hanh snippets" » "trinh tu hanh snippets", "trinh thi hanh snippets", "trinh thuc thanh snippets", "trinh thuc anh snippets", "trinh thuc hinh snippets", "trinh thuc hanh slippers"
"dung cac code snippets" » "luong cac code snippets", "dung cho code snippets", "dung tai code snippets", "dung cac cong snippets", "dung cac co snippets", "dung cac che snippets", "dung cac code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("trinh thuc hanh snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh thuc hanh snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh thuc hanh snippets ) or ( dung cac code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh thuc hanh snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.