Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung tuan » trung thanh, trung tam, tran tuan
hieu hanh » hien hanh, hieu manh, hien nhanh
tuan tong » toan tong, thuan trong, toan thong
tong cong » trong cong, cong cong, dung cong
cong dan » cong san, cong tan, huong dan
dan hanh » dang hanh, dan khanh, dan thanh
hanh cac » hang cac, hanh cat, hanh cham

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 hanh) or (dieu hanh)) - thanh trung tuan tong cong dan hanh cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu hanh) OR (dieu hanh)) - thanh trung tuan tong cong dan hanh cac*.