Perhaps you should try some spelling variations:
hieu tinh » chieu tinh, lieu tinh, kieu tinh
tuong cua » truong cua, huong cua, thong cua
doc hieu » toc thieu, hoc thieu, hoc hien
tung cua » trung cua, dung cua, tang cua
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
chon cac » cho cac, thong cac, hoc cac

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: doc hieu tinh - thanh ((tung cua) OR (tuong cua)) thong ((cong dan) OR (cong tan)) chon cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu tinh - thanh ((tung cua) OR (tuong cua)) thong ((cong dan) or (cong tan)) chon cac~".
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - thanh ((tung cua) OR (tuong cua)) thong ((cong dan) or (cong tan)) chon cac*.