Perhaps you should try some spelling variations:
thanh trung » thanh tung
thien dang » thien bang, thien danh, thien nang
nhung cong » dung cong, thong cong, hang cong
tien manh » tien anh, tien thanh, tieng anh
trung va » truong va, trang va, trung ha
dan than » ban than, van than, dan toan
dan chan » dan gian, dan ca, van chat

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: hoc ((tien manh) OR (thien dang)) - thanh trung va nhung cong ((dan than) OR (dan chan)) cao~.
• Adding a wildcard symbol may retrieve word variants: hoc ((tien manh) or (thien dang)) - thanh trung va nhung cong ((dan than) or (dan chan)) cao*.