Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
trung chan » trung phan, trung can, trung nhan
trong chan » trong chuan, trong cham, trong can
hieu xanh » hieu manh, hieu nganh, dieu hanh
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu xanh) or (chieu xanh)) - thanh ((trung chan) OR (trong chan)) dung cong tan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (chieu xanh)) - thanh ((trung chan) OR (trong chan)) dung cong tan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) or (chieu xanh)) - thanh ((trung chan) OR (trong chan)) dung cong tan toan ban".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (chieu xanh)) - thanh ((trung chan) OR (trong chan)) dung cong tan toan ban*.