Perhaps you should try some spelling variations:
tuan nhung » quan nhung, tuan hung, thuat nhung
chieu sang » chieu sach, chieu xanh, nhieu tang
nhung cong » dung cong, thong cong, hang cong
hieu lang » hieu quang, nhieu tang, hieu van
hanh tran » hanh trang, thanh tran, hanh tram
tran tuan » tran xuan, tran quang, tran thanh
hach toan » thanh toan, manh toan
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: hoc ((chieu sang) OR (hieu lang)) - hanh tran tuan nhung cong ((tac toan) OR (hach toan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (hieu lang)) - hanh tran tuan nhung cong ((tac toan) OR (hach toan)) cao~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu lang)) - hanh tran tuan nhung cong ((tac toan) OR (hach toan)) cao*.