Perhaps you should try some spelling variations:
dung phuong » dung thuong, bang phuong, dung chung
hanh trang » thanh trung, canh tranh, hanh trinh
ho trieu » mot trieu, 25 trieu, 30 trieu
trang va » tran van, hang va
ban toan » ban than, van toan, bao toan
bai toan » bai tap
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho trieu tinh - hanh trang va dung phuong ((ban toan) OR (bai toan)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho trieu tinh - hanh trang va dung phuong ((ban toan) OR (bai toan)) ban".
• Adding a wildcard symbol may retrieve word variants: ho trieu tinh - hanh trang va dung phuong ((ban toan) OR (bai toan)) ban*.