Perhaps you should try some spelling variations:
thanh truong » thanh trung, thanh thuong, thanh huong
thanh tung » thanh cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
dang cong » dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
cua dang » cua cong, cua ban
hang cau » hang dau, hang ca, nhung cau
han cau » phan cau, van cau, han dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu manh - ((thanh truong) OR (thanh tung)) cua dang cong trinh ((han cau) or (hang cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - ((thanh truong) OR (thanh tung)) cua dang cong trinh ((han cau) OR (hang cau))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu manh - ((thanh truong) OR (thanh tung)) cua dang cong trinh ((han cau) or (hang cau))*".