Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
thi chieu » thi chien, thi hieu, theo chieu
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
ho chieu » theo chieu, hoc thieu, doi chieu
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: ((ho 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: ((ho chieu) OR (thi chieu)) sach - hanh tranh cua hang cong ((tap toan) OR (tap doan)) cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (thi chieu)) sach - hanh tranh cua hang cong ((tap toan) OR (tap doan)) cao*".