Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh quan
khong cong » thong cong, khong cang, chong cong
tieu sach » chieu sach, dien sach, te sach
cua khong » hua khong, cua phuong, cua thuong
trinh han » trinh quan
anh mang » hanh mang, anh bang, anh dang
mang cua » manh cua, dung cua, ban cua

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - anh mang cua khong cong ((trinh toan) OR (trinh han)) cau~".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - anh mang cua khong cong ((trinh toan) OR (trinh han)) cau*.