Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
trinh luan » trinh luat, trinh quan, trinh toan
hanh manh » hanh mang, lanh manh, hoang manh
cua nhung » va nhung
trinh han » trinh quan
hoi hieu » hoi phieu, hoi tieu, moi hieu
manh cua » doanh cua, ban cua

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: hoi hieu quang - hanh manh cua nhung cong ((trinh luan) OR (trinh han)) dau~.
• Adding a wildcard symbol may retrieve word variants: hoi hieu quang - hanh manh cua nhung cong ((trinh luan) or (trinh han)) dau*.