Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
hieu lang » chieu sang, hieu quang, nhieu tang
cua nhung » va nhung
trinh van » trinh han, trinh quan, trinh toan
tinh cua » trinh cua, sinh cua, tinh chat
van dau » van dao, phan dau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu lang) or (hieu qua)) - nhanh tinh cua nhung cong trinh van dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu qua)) - nhanh tinh cua nhung cong trinh van dau.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (hieu qua)) - nhanh tinh cua nhung cong trinh van dau*.