Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu tinh » chieu tinh, lieu tinh, kieu tinh
va phuong » va thuong, cac phuong
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan tap » toan ban
tung va » trung va, tuong va, dung va

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 tinh - thanh tung va phuong ((cong dan) OR (cong tan)) toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu tinh - thanh tung va phuong ((cong dan) OR (cong tan)) toan tap".
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - thanh tung va phuong ((cong dan) OR (cong tan)) toan tap*.