Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
vang cong » dang cong, van cong, bang cong
van thanh » ban thanh, van tuan
cong tac » cong ty
tac vang » cac van, tac dung, tac dong
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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 cong tac vang cong ((((dan toan) or (dan than))) or (van thanh)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - thanh cong tac vang cong ((((dan toan) OR (dan than))) OR (van thanh)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh cong tac vang cong ((((dan toan) or (dan than))) or (van thanh)) cao*.