Perhaps you should try some spelling variations:
trong thuoc » trong thuc, trung thuoc, trong thuong
hieu sach » chieu sach, hieu cach, dien sach
trong thu » trong nha
tong cong » trong cong, cong cong, dung cong
cong hach » cong sach, cong thanh, cong khanh
hach toan » thanh toan, manh toan
doc hieu » toc thieu, hoc thieu, hoc hien
toan ban » van ban

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 - sinh ((trong thuoc) or (trong thu)) tong cong hach toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - sinh ((trong thuoc) OR (trong thu)) tong cong hach toan ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - sinh ((trong thuoc) or (trong thu)) tong cong hach toan ban*.