Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
nhung cong » thong cong, hang cong, nhung don
hanh mang » nhanh mang, hanh trang, nhanh lang
dung cong » dung trong
mang vua » mang cua, mang va, hang va
chan cau » phan cau, chinh cau, nhanh cau
can cau » van cau, ban cau, ca cau

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: hoc hien nhanh - hanh mang vua ((nhung cong) OR (dung cong)) dan ((chan cau) OR (can cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien nhanh - hanh mang vua ((nhung cong) OR (dung cong)) dan ((chan cau) or (can cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc hien nhanh - hanh mang vua ((nhung cong) OR (dung cong)) dan ((chan cau) or (can cau))*.