Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trang » thanh trung, canh tranh, hanh trinh
hieu lang » chieu sang, hieu quang, nhieu tang
trang cua » tranh cua, tang cua, trung cua
nhung don » nhung van, nhung bo
dang cong » dung cong
hop hieu » hop nhieu, hoi hieu, hoc thieu
tuan tai » toan tai, quan tai, tan tai

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: hop hieu lang - hanh trang cua ((((nhung cong) OR (nhung don))) OR (dang cong)) anh tuan tai~.
• Adding a wildcard symbol may retrieve word variants: hop hieu lang - hanh trang cua ((((nhung cong) or (nhung don))) or (dang cong)) anh tuan tai*.