Perhaps you should try some spelling variations:
thien chieu » thien chien, thien hieu, thien nhien
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
trung tuan » trung thanh, trung tam, tran tuan
tuan dung » tuan duong, tran dung, tan dung
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: thien chieu sang - thanh trung tuan dung ((huong dan) or (cong tan)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thien chieu sang - thanh trung tuan dung ((huong dan) OR (cong tan)) van ban.
• Adding a wildcard symbol may retrieve word variants: thien chieu sang - thanh trung tuan dung ((huong dan) or (cong tan)) van ban*.