Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
hien xanh » hien hanh, hien nhanh, chieu xanh
tinh dinh » trinh dinh, tinh ninh, tinh binh
hang cong » dang cong, hang nong, bang cong
dinh cua » dinh cuu, sinh cua, dinh cu
tran cau » tran chau, toan cau, ran cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien xanh - tinh dinh cua ((nhung cong) or (hang cong)) tan tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - tinh dinh cua ((nhung cong) OR (hang cong)) tan tran cau*.