Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tran » hanh trang, thanh tran, thanh trang
hanh tram » hanh tam, hanh trang, thanh tran
van nhung » van nhuong, va nhung, van hung
cong tinh » cong trinh, cong vinh, long tinh
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
ho hieu » ho chieu, hoi hieu, nho hieu

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: ho hieu lang - ((hanh tran) OR (hanh tram)) van nhung cong tinh ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - ((hanh tran) OR (hanh tram)) van nhung cong tinh ((toan cau) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - ((hanh tran) OR (hanh tram)) van nhung cong tinh ((toan cau) or (toan ban))*.