Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
hoc thieu » toc thieu, hoc hien
toan nang » toan mang, toan tang, toan thang
doc hieu » toc thieu, hoc hien
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (hoc thieu)) sach - thanh toan nang song ((cong dan) OR (cong san)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc thieu)) sach - thanh toan nang song ((cong dan) OR (cong san)) toan tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (hoc thieu)) sach - thanh toan nang song ((cong dan) OR (cong san)) toan tap*".