Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
dang quang » dung quang, nang quan, dang hung
tranh cua » doanh cua, manh cua
quang tap » quang tay, quang tuan, quang tran
cua dang » cua cong, cua ban
tap toan » tap doan, tap quan, bai toan
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 quang tap 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 quang tap toan cao*.