Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo chieu » theo tieu, theo chu, thi chieu
nhung cong » thong cong, hang cong, nhung don
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
ho chieu » hoc thieu, doi chieu, mot chieu
tac tran » tan tran, tac trai, tac tren
tran tap » toan tap, tran tan, tran tuan

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

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