Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
hanh nang » anh nang, ganh nang, hanh mang
hang cong » dang cong, hang nong, bang cong
cao hang » cao dang, cao tang, cao bang
van toan » van tuan, van tan, van thanh
dan than » dan chan, ban than, van than

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu xanh) OR (chieu sach)) - hanh nang cao hang cong ((van toan) OR (dan than)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu xanh) OR (chieu sach)) - hanh nang cao hang cong ((van toan) or (dan than)) cao~".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu xanh) OR (chieu sach)) - hanh nang cao hang cong ((van toan) or (dan than)) cao*.