Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
tong cong » trong cong, cong cong, dung cong
tinh cua » trinh cua, sinh cua, tinh chat
quan cau » quang cao, toan cau, quan ha
ho hieu » ho chieu, hoi hieu, nho hieu
qua dau » qua da, qua bau, qua dan

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 - hanh tinh cua ((nhung cong) or (tong cong)) trinh ((qua dau) or (quan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh tinh cua ((nhung cong) OR (tong cong)) trinh ((qua dau) OR (quan cau)).
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh tinh cua ((nhung cong) or (tong cong)) trinh ((qua dau) or (quan cau))*.