Perhaps you should try some spelling variations:
thieu xanh » thien anh, thien danh
chieu xanh » chieu sach, chieu sang, chieu tinh
thanh tung » thanh cong
hieu manh » hieu nganh, dieu hanh, hien hanh
trong tac » trong cac, tuong tac, trong tan
tung tan » tung dan, cung tan, hung tan
tan dung » tran dung, tin dung, van dung
tac tren » rac tren, tai tren, tap tren
tren may » tiet may

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 (((hieu manh) OR (chieu xanh)))) - thanh tung tan dung trong tac tren may~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (((hieu manh) OR (chieu xanh)))) - thanh tung tan dung trong tac tren may.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (((hieu manh) OR (chieu xanh)))) - thanh tung tan dung trong tac tren may".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (((hieu manh) OR (chieu xanh)))) - thanh tung tan dung trong tac tren may*.