Perhaps you should try some spelling variations:
buoc trien » nuoc tren, duoc tren, duoc thien
thanh tung » thanh cong
tuan trong » thuan trong, quan trong, tran trong
toc trien » toc thieu, moc tren, hoc tren
cong san » cong tac
san than » sang than, san thanh, ban than
than cau » toan cau, phan cau, than cap

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