Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
lang cong » dang cong, bang cong, hang cong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap
va lang » va nang, hoa lang

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 - ((thanh tung) or (thanh trung)) va lang cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((thanh tung) OR (thanh trung)) va lang cong san toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((thanh tung) or (thanh trung)) va lang cong san toan cao*.