Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
hanh sinh » hanh tinh, hinh sinh, hanh chinh
hanh dinh » thanh dinh, hinh dinh, hanh tinh
cua nhung » va nhung
trinh san » trinh han, trinh quan, trinh toan
san dau » van dau, san diu, ban dau

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) OR (chieu sang)) - ((hanh sinh) OR (hanh dinh)) cua nhung cong trinh san dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (chieu sang)) - ((hanh sinh) or (hanh dinh)) cua nhung cong trinh san dau~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) OR (chieu sang)) - ((hanh sinh) or (hanh dinh)) cua nhung cong trinh san dau*.