Perhaps you should try some spelling variations:
tran tuan » tran xuan, tran quang, tran thanh
dung cong » dung trong
25 trieu » 30 trieu
tra tuan » tra quan, tri tuan, ta tuan
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: 25 trieu tinh - thanh ((tra tuan) OR (tran tuan)) dung cong tap toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "25 trieu tinh - thanh ((tra tuan) OR (tran tuan)) dung cong tap toan cau".
• Adding a wildcard symbol may retrieve word variants: 25 trieu tinh - thanh ((tra tuan) OR (tran tuan)) dung cong tap toan cau*.