Perhaps you should try some spelling variations:
thanh tran » thanh trang, thanh toan, thanh tra
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
tran tuan » tran xuan, tran quang, tran thanh
tuan dung » tuan duong, tran dung, tan dung
dung cong » dung trong
tan toan » tan tran, tap toan, van toan
bai toan » bai tap

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 ((hien xanh) OR (hien hanh)) - thanh tran tuan dung cong ((tan toan) OR (bai toan)) tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) OR (hien hanh)) - thanh tran tuan dung cong ((tan toan) or (bai toan)) tap~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) OR (hien hanh)) - thanh tran tuan dung cong ((tan toan) or (bai toan)) tap*.