Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
nhan tong » nhan trong, nhan thong, nhan tuong
cua nhan » ca nhan, cua ngan, cua nha
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan
bai toan » bai tap

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