Perhaps you should try some spelling variations:
thieu xanh » hieu manh, thien anh, thien danh
chieu xanh » chieu sach, chieu sang, chieu tinh
mach benh » bach benh, mac benh, cac benh
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
benh cua » benh chua, menh cua, ben cua
van tan » van tuan, van ban, van tai
tan tap » toan tap, han tap, tan tat

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 (chieu xanh)) - mach benh cua ((hang cong) or (dang cong)) van tan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (chieu xanh)) - mach benh cua ((hang cong) OR (dang cong)) van tan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (chieu xanh)) - mach benh cua ((hang cong) or (dang cong)) van tan tap*.