Perhaps you should try some spelling variations:
trung tay » trung tam, trung tai, trung tuan
trung gay » trong gay, trung tam, trung cap
bang cong » dang cong, bang song, hang cong
ho thiet » hoc thiet, hoa thiet, so thiet
ho chieu » theo chieu, hoc thieu, doi chieu
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan lap » phan dau

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 thiet) OR (ho chieu)) tach - hanh ((trung tay) OR (trung gay)) bang cong tan phan lap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho thiet) or (ho chieu)) tach - hanh ((trung tay) OR (trung gay)) bang cong tan phan lap~".
• Adding a wildcard symbol may retrieve word variants: ((ho thiet) or (ho chieu)) tach - hanh ((trung tay) OR (trung gay)) bang cong tan phan lap*.