Perhaps you should try some spelling variations:
tien thanh » tien thinh, tran thanh, den thanh
hien xanh » hien hanh, hien nhanh, chieu xanh
dang cong » dung cong
van quan » van ban
cong van » cong vang, cong san, song van
van than » van thanh, van thang, van tuan
than cau » toan cau, phan cau, than cap

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 (tien thanh)) - canh ((ban quan) OR (van quan)) dang cong van than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (tien thanh)) - canh ((ban quan) OR (van quan)) dang cong van than cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (tien thanh)) - canh ((ban quan) OR (van quan)) dang cong van than cau*.