Perhaps you should try some spelling variations:
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
trinh luan » trinh quan, trinh han, trinh toan
nhung cong » dung cong, thong cong, hang cong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan tap » toan ban

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: toc ((thieu sach) OR (thien hach)) - hanh ((trinh luan) OR (trinh luat)) nhung cong san toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu sach) OR (thien hach)) - hanh ((trinh luan) or (trinh luat)) nhung cong san toan tap~".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sach) OR (thien hach)) - hanh ((trinh luan) or (trinh luat)) nhung cong san toan tap*.