Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
tranh cua » doanh cua, manh cua
dang hung » dang quang, manh hung, dang cong
cua dang » cua cong, cua ban
hung bai » nhung bai, dung bai, cung bai
bai toan » bai tap
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((dieu hanh) or (chieu tinh)) - canh tranh cua dang hung bai toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((dieu hanh) OR (chieu tinh)) - canh tranh cua dang hung bai toan cao*.