Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
tung hieu » trung hieu, tang hieu, thuong hieu
dung hieu » dong hieu, dung tieu, trung hieu
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 thieu sach - thanh ((tung hieu) or (dung hieu)) trong cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thanh ((tung hieu) OR (dung hieu)) trong cong san toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh ((tung hieu) or (dung hieu)) trong cong san toan cau*.