Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
tien manh » tien anh, tien thanh, tieng anh
tranh cua » doanh cua, manh cua
dung cong » dung trong
hoc tien » hoc tieng, hoc hien, hoc vien
chay cau » chay chua, cay ca, phan cau
chay cao » cay cao, chat cao, nha cao

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 tien manh - canh tranh cua ((nhung cong) OR (dung cong)) san ((chay cau) OR (chay cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc tien manh - canh tranh cua ((nhung cong) or (dung cong)) san ((chay cau) OR (chay cao))~".
• Adding a wildcard symbol may retrieve word variants: hoc tien manh - canh tranh cua ((nhung cong) or (dung cong)) san ((chay cau) OR (chay cao))*.