Perhaps you should try some spelling variations:
thanh trung » thanh tung
tien manh » tien anh, tien thanh, tran manh
trung hoc » trung quoc
hang cong » dang cong, hang nong, bang cong
hoc hang » hoc hanh, hoc bang, hoc tang
dan toan » van toan, dan than, manh toan
dan chan » dan gian, dan ca, van chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((tien manh) OR (tieng anh)) - thanh trung hoc hang cong ((dan toan) or (dan chan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien manh) OR (tieng anh)) - thanh trung hoc hang cong ((dan toan) OR (dan chan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((tien manh) OR (tieng anh)) - thanh trung hoc hang cong ((dan toan) or (dan chan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((tien manh) OR (tieng anh)) - thanh trung hoc hang cong ((dan toan) or (dan chan)) cao*.