Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trung » thanh trung, hanh trang, manh trung
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
dang cong » dung cong
nho hieu » nha hieu, nho sieu, nhu hieu
toan tai » toan tap, doanh tai, toan ban
toan cao » toan ban, toan tap

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: nho hieu lang - hanh trung cua ((nhung cong) OR (dang cong)) dan ((toan tai) OR (toan cao))~.
• Adding a wildcard symbol may retrieve word variants: nho hieu lang - hanh trung cua ((nhung cong) or (dang cong)) dan ((toan tai) or (toan cao))*.