Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
dong hoa » dong hoc, dong co
cham duc » pham duc, cham soc, pham duy
van chia » ban chia, van chien, van chinh
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty dong » tay dong, tu dong, ly dong
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu tu » chieu tu, hieu tuc, hien tu
tu cham » toc cham, thi cham
duc ban » duc tan, duc van, dua ban
van chi » van chien, luan chi, van chat

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty dong hoa hoi. hieu tu cham duc ban thanh ((van chia) or (van chi)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty dong hoa hoi. hieu tu cham duc ban thanh ((van chia) OR (van chi)) tre.
• Adding a wildcard symbol may retrieve word variants: so sach ty dong hoa hoi. hieu tu cham duc ban thanh ((van chia) or (van chi)) tre*.