Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
hang cong » dang cong, hang nong, bang cong
ho chieu » hoc thieu, doi chieu, mot chieu
tinh cua » trinh cua, sinh cua, tinh chat
cua hang » cua dang, cua nhung, cua cong
tap toan » tap doan, tap quan, bai toan

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 (theo chieu)) sach - hanh tinh cua hang cong ((tap toan) or (bai tap)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chieu)) sach - hanh tinh cua hang cong ((tap toan) OR (bai tap)) cao.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo chieu)) sach - hanh tinh cua hang cong ((tap toan) or (bai tap)) cao*.