Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trung hung » trung dung, trong hung, truong chung
hieu sach » hieu cach, dien sach, hieu cac
hung cong » nhung cong, hung cuong, phung cong
anh xuan » anh tuan, thanh xuan, anh xquang
anh quan » anh tuan, ban quan, anh nhan
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap

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 sach) OR (chieu sach)) - ((anh xuan) or (anh quan)) trung hung cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sach) OR (chieu sach)) - ((anh xuan) OR (anh quan)) trung hung cong san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sach) OR (chieu sach)) - ((anh xuan) or (anh quan)) trung hung cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) OR (chieu sach)) - ((anh xuan) or (anh quan)) trung hung cong san toan cau*.