Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
doi chieu » doc hieu, doi chi, ho chieu
tranh cua » doanh cua, manh cua
tong cong » trong cong, cong cong, dung cong
theo chu » theo chieu, cho chu, chao chu
cua tong » cua cong, cua dong, cua nong
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (theo chu)) tinh - hanh tranh cua tong cong ((tan toan) OR (tap toan)) cau~.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (theo chu)) tinh - hanh tranh cua tong cong ((tan toan) or (tap toan)) cau*.