Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
anh nang » ganh nang, anh bang, anh dang
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan cao » toan ban, toan tap
nang va » nang van, hang va, nang ma
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sach) or (chieu sang)) - anh nang va dung ((cong tan) OR (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (chieu sang)) - anh nang va dung ((cong tan) OR (cong san)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) or (chieu sang)) - anh nang va dung ((cong tan) OR (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (chieu sang)) - anh nang va dung ((cong tan) OR (cong san)) toan cao*.