Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
doi hieu » doi chieu, doc hieu, doi hien
trong xa » trong xay, trong ca, trong xu
cong van » cong vang, cong san, song van
van tuan » van quan, van ban, anh tuan
tuan ban » tuan bang, toan ban, luan ban

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: doi hieu lang - hanh ((trong cac) OR (trong xa)) dung cong van tuan ban~.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - hanh ((trong cac) or (trong xa)) dung cong van tuan ban*.