Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo chieu » theo tieu, theo chu, thi chieu
trung cua » truong cua, trung tuan, trung cap
tong cong » trong cong, cong cong, dung cong
khoan cam » khoa cam, khoan va, phan cam
thanh lap » thanh san, phan lap, thanh hai
ho chieu » hoc thieu, doi chieu, mot chieu
cua tong » cua cong, cua dong, cua nong
cong tan » cong tac, cong san, cong thanh

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: ((ho chieu) OR (theo chieu)) xanh - thanh trung cua tong cong tan ((khoan cam) OR (thanh lap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (theo chieu)) xanh - thanh trung cua tong cong tan ((khoan cam) or (thanh lap))~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (theo chieu)) xanh - thanh trung cua tong cong tan ((khoan cam) or (thanh lap))*.