Perhaps you should try some spelling variations:
thanh trung » thanh tung
doi chieu » doc hieu, doi chi, ho chieu
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
cua dung » cua dang, cua dong, qua dung
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (hoc thieu)) xanh - thanh trung cua dung ((cong dan) or (cong tan)) phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (hoc thieu)) xanh - thanh trung cua dung ((cong dan) OR (cong tan)) phan tu.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (hoc thieu)) xanh - thanh trung cua dung ((cong dan) or (cong tan)) phan tu*.