Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
dieu tinh » diep tinh, lieu tinh, dien tinh
quan tong » quan trong, quan long, quan nong
quan dong » quang dong, quan long, quan hoang
hoc dieu » hoc thieu, hoc hien
cong dan » cong san, cong tan, huong dan
than cau » phan cau, than cap, thanh chau
toan cau » toan cao, toan ban, toan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc dieu tinh - thanh toan ((quan tong) OR (quan dong)) cong dan ((than cau) OR (toan cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc dieu tinh - thanh toan ((quan tong) OR (quan dong)) cong dan ((than cau) or (toan cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc dieu tinh - thanh toan ((quan tong) OR (quan dong)) cong dan ((than cau) or (toan cau))*.