Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
nhung cong » thong cong, hang cong, nhung don
mot chieu » doi chieu, ho chieu
dung cong » dung trong
tinh cua » trinh cua, sinh cua, tinh chat
van tai » von tai, van tuan
tai cau » tai cac, tai cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((mot chieu) or (theo chieu)) xanh - nhanh tinh cua ((nhung cong) OR (dung cong)) van tai cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((mot chieu) OR (theo chieu)) xanh - nhanh tinh cua ((nhung cong) OR (dung cong)) van tai cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mot chieu) or (theo chieu)) xanh - nhanh tinh cua ((nhung cong) OR (dung cong)) van tai cau".
• Adding a wildcard symbol may retrieve word variants: ((mot chieu) or (theo chieu)) xanh - nhanh tinh cua ((nhung cong) OR (dung cong)) van tai cau*.