Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
doi chieu » doc hieu, doi chi, ho chieu
thi chieu » thi chien, thi hieu, theo chieu
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
cua hang » cua dang, cua nhung, cua cong
tap toan » tap quan, bai toan
tap doan » tap quan

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

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