Perhaps you should try some spelling variations:
tuan duong » tuyen duong, tuong duong, van duong
chieu sang » chieu sach, chieu xanh, hieu lang
thien anh » thien danh, tien anh, thien thanh
tuan dung » tran dung, tan dung, tuan dang
cong tac » cong ty
tac tran » tan tran, tac trai, tac tren
tran tan » tran tuan, tran van, tran 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: hoc ((chieu sang) OR (thien anh)) - tinh toan ((tuan dung) OR (tuan duong)) cong tac tran tan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (thien anh)) - tinh toan ((tuan dung) OR (tuan duong)) cong tac tran tan~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (thien anh)) - tinh toan ((tuan dung) OR (tuan duong)) cong tac tran tan*.