Perhaps you should try some spelling variations:
thi hanh » thi thanh
cua dung » cua dang, qua dung, cua rung
cua dong » chua dong, cua cong, cua dang
cong bai » cuong bai, cong hai, cung bai
doi thi » doi thoi, do thi, doi khi
bai tao » bai tap, tai tao, ai tao
tao cao » bao cao, toan cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi thi hanh - canh tranh ((cua dung) or (cua dong)) cong bai tao cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi thi hanh - canh tranh ((cua dung) OR (cua dong)) cong bai tao cao.
• Adding a wildcard symbol may retrieve word variants: doi thi hanh - canh tranh ((cua dung) or (cua dong)) cong bai tao cao*.