Perhaps you should try some spelling variations:
tham thuoc » pham thuoc, tham thuc, nha thuoc
thuoc sach » hoc sach, nuoc sach, thuat sach
sach tham » sach nha
sach nghe » sach nghiep, sach nha, anh nghe
tam thuat » tam than, thu thuat, va thuat
sach tam » sach tai, sach dao, sach bai
su sach » so sach
nghe he » nghe che, nghe ha, nghe te
vu sach » vu bach, vu khach
khoa he » hoa he, khoa hoc, khong he
toan » tran

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach tham thuoc sach nghe he thong ) or ( vu sach tam thuat toan khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tham thuoc sach nghe he thong ) OR ( vu sach tam thuat toan khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach tham thuoc sach nghe he thong ) or ( vu sach tam thuat toan khoa he thong ))*.