Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
hanh trung » thanh trung, hanh trang, manh trung
cong thanh » dong thanh, cong trinh, cong tan
tuan dang » tran dang, tuan bang, tuan dung
dang cong » dung cong
tai lieu » vat lieu
toan ban » van 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 trung tuan dang cong thanh ((toan tap) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tai lieu) or (theo tieu)) tinh - hanh trung tuan dang cong thanh ((toan tap) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: ((tai lieu) or (theo tieu)) tinh - hanh trung tuan dang cong thanh ((toan tap) OR (toan ban))*.