Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, thien anh, thien danh
thanh tung » thanh cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
trong tac » trong cac, tuong tac, trong tan
tan dung » tran dung, tin dung, dan dung
van dung » van dong, xay dung, tin 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)) - thanh tung ((tan dung) OR (van dung)) trong tac tren may~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu manh)) - thanh tung ((tan dung) OR (van dung)) trong tac tren may.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (hieu manh)) - thanh tung ((tan dung) OR (van dung)) trong tac tren may".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (hieu manh)) - thanh tung ((tan dung) OR (van dung)) trong tac tren may*.