Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
dung cong » dung trong
dung cua » dung luan, dung cho
cong van » cong vang, cong san, song van
van tan » van tuan, van ban, van tai
tan ca » tan cua, tang ca, dan ca

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: hoc ((hien xanh) OR (hien hanh)) - thanh ((dung cua) OR (trung tuan)) dung cong van tan ca~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) OR (hien hanh)) - thanh ((dung cua) or (trung tuan)) dung cong van tan ca~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) OR (hien hanh)) - thanh ((dung cua) or (trung tuan)) dung cong van tan ca*.