Perhaps you should try some spelling variations:
tham thuoc » pham thuoc, tham thuc, nha thuoc
tran thong » toan thong, tran hong, tran trong
thuoc sach » hoc sach, nuoc sach, thuat sach
sach khong » sach thuong, sach song, bach khang
tri thuoc » tri thuc, tri hoc, tin thuoc
thuoc ban » thuoc tan, thuoc dang, thu ban
khoa tran » khoa than, khoa trung, thoan tran
sach tham » sach nha
sach tri » sach tai, sach tren, sach truc
ban khoa » san khoa, van khoa, ba khoa
khong he » khong khi, hong ha, khong _
su sach » so sach, vu sach

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: (( su sach tri thuoc ban khoa tran thong ) OR ( su sach tham thuoc sach khong he thong ))~.
• Adding a wildcard symbol may retrieve word variants: (( su sach tri thuoc ban khoa tran thong ) or ( su sach tham thuoc sach khong he thong ))*.