Perhaps you should try some spelling variations:
manh trung » manh tung, thanh trung, manh hung
trung tuan » trung thanh, trung tam, tran tuan
hieu manh » chieu xanh, hieu nganh, dieu hanh
hieu lang » chieu sang, hieu quang, nhieu tang
hach toan » thanh toan, manh toan
tuan ban » tuan bang, toan ban, luan ban
ban cong » bang cong, van cong, phan cong
tac toan » tap toan, tam toan, tich toan

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: theo ((hieu manh) OR (hieu lang)) - manh trung tuan ban cong ((tac toan) OR (hach toan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu manh) or (hieu lang)) - manh trung tuan ban cong ((tac toan) OR (hach toan)) cao~".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu manh) or (hieu lang)) - manh trung tuan ban cong ((tac toan) OR (hach toan)) cao*.