Perhaps you should try some spelling variations:
dong truong » duong truong, dong trong, dong thuong
thanh tran » thanh trang, thanh toan, thanh tra
hieu lang » chieu sang, hieu quang, nhieu tang
phap toan » phap hoan, phap luan, phap phan
tran van » luan van
tam toan » tap toan, tam than, pham toan
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - thanh tran van dong truong ((tam toan) or (phap toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh tran van dong truong ((tam toan) OR (phap toan)) ban.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh tran van dong truong ((tam toan) or (phap toan)) ban*.