Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung dung » phuong dung, ung dung, trung dung
thong dung » thong cong, thong thuong
trung cua » truong cua, trung tuan, trung cap
30 trieu » 25 trieu
toan cao » toan tap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: 30 trieu tinh - thanh trung cua ((nhung dung) OR (thong dung)) manh ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: 30 trieu tinh - thanh trung cua ((nhung dung) OR (thong dung)) manh ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "30 trieu tinh - thanh trung cua ((nhung dung) OR (thong dung)) manh ((toan cao) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: 30 trieu tinh - thanh trung cua ((nhung dung) OR (thong dung)) manh ((toan cao) or (toan ban))*.