Perhaps you should try some spelling variations:
trong tuan » trong quan, trung tuan, trong tan
hanh trong » hanh trang, anh trong, hinh trong
trinh toan » tinh toan, thanh toan, trinh han
tuan dang » tran dang, tuan bang, tuan dung
dang cong » dung cong
tai lieu » vat lieu
toan tap » toan ban

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: ((tai lieu) OR (theo tieu)) tinh - hanh trong tuan dang cong trinh toan tap~.
• Adding a wildcard symbol may retrieve word variants: ((tai lieu) or (theo tieu)) tinh - hanh trong tuan dang cong trinh toan tap*.