Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu xanh » chieu xanh, hieu manh, thien anh
tuan dung » tuan duong, tran dung, tuan dang
tien anh » tieng anh, tien manh, dien anh
tan dung » tran dung, tin dung, van dung
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan tap » toan ban

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

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