Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
hung thang » cang thang, hung tran
khong cong » thong cong, khong cang, chong cong
thang cua » thong cua, hang cua, than cua
cua khong » hua khong, cua phuong, cua thuong
ho chieu » hoc thieu, doi chieu, mot chieu
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: ((theo chieu) or (ho chieu)) sach - hung thang cua khong cong ((tap toan) OR (tap doan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (ho chieu)) sach - hung thang cua khong cong ((tap toan) OR (tap doan)) cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (ho chieu)) sach - hung thang cua khong cong ((tap toan) OR (tap doan)) cao*".