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
cong tac » cong ty
tac vang » cac van, tac dung, tac dong
dan toan » manh toan, xuan toan, dien toan
dan than » dan chan, ban than, van than
van toan » van tuan, van tan, van thanh

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 toan)) 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 toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - thanh cong tac vang cong ((((dan toan) OR (dan than))) or (van toan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh cong tac vang cong ((((dan toan) OR (dan than))) or (van toan)) cao*.