Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hieu lang » chieu sang, hieu quang, nhieu tang
trang xay » trong xay, trang xa, trang va
dung cong » dung trong
quang ban » quang binh, quang tuan, quang tran
doi hieu » doi chieu, doc hieu, doi hien
cong van » cong vang, cong san, song van
tuan ban » tuan bang, luan ban, thuat ban
toan ban » van 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 trang xay dung cong van ((((tuan ban) OR (quang ban))) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - hanh trang xay dung cong van ((((tuan ban) OR (quang ban))) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - hanh trang xay dung cong van ((((tuan ban) OR (quang ban))) or (toan ban))*.