Perhaps you should try some spelling variations:
sinh sach » chinh sach, sang sach, sinh danh
trung cap » truong cao
dung cong » dung trong
sinh san » trinh san, sinh vat, sinh va
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: hoc ((sinh sach) OR (sinh san)) - thanh ((trung cap) or (trung tam)) dung cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sinh sach) OR (sinh san)) - thanh ((trung cap) OR (trung tam)) dung cong san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((sinh sach) OR (sinh san)) - thanh ((trung cap) or (trung tam)) dung cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((sinh sach) OR (sinh san)) - thanh ((trung cap) or (trung tam)) dung cong san toan cau*.