Perhaps you should try some spelling variations:
tham thuoc » pham thuoc, tham thuc, nha thuoc
thuoc bang » thuoc ban, thuoc dang, truoc bang
phan thong » phan thuong, phan hong, phan tong
sach tham » sach nha
sach tren » sach tien, sach tranh
tren truc » tren thuc, trang truc, trung truc
bach khoa » anh khoa
hoc sach » hoc sinh, hoc cac, hoc anh
su sach » so sach, vu sach
bang co » bang cho, bang cot, ban co
khoa he » hoa he, khoa hoc, khong he

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 bang co phan thong ) or ( hoc sach tren truc bach khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tham thuoc bang co phan thong ) OR ( hoc sach tren truc bach khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach tham thuoc bang co phan thong ) or ( hoc sach tren truc bach khoa he thong ))*.