Perhaps you should try some spelling variations:
thanh trung » thanh tung
buoc trien » nuoc tren, duoc tren, duoc thien
trung tuan » trung thanh, trung tam, tran tuan
tuan trong » thuan trong, quan trong, tran trong
thanh cau » thanh chau, thanh mau, nhanh cau
hoc tren » moc tren, hoc truyen, thuoc tren
cong tac » cong ty

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 tren) OR (buoc trien)) quang - thanh trung tuan trong ((cong san) OR (cong tac)) thanh cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc tren) or (buoc trien)) quang - thanh trung tuan trong ((cong san) OR (cong tac)) thanh cau~".
• Adding a wildcard symbol may retrieve word variants: ((hoc tren) or (buoc trien)) quang - thanh trung tuan trong ((cong san) OR (cong tac)) thanh cau*.