Perhaps you should try some spelling variations:
tien thuoc » trien thuoc, tin thuoc, bien thuoc
phan thong » phan thuong, phan hong, phan tong
thuoc sach » hoc sach, nuoc sach, thuat sach
sach tien » sach tren, sach thieu
thuoc bac » thuoc ban, thuoc bao, thuoc bat
ki thuat » ky thuat
toan hoa » toan khoa, toan hoat, toan hoc
dan tong » dan trong, han tong, dan dong
su sach » so sach, vu sach
ha phan » hoa phan, hai phan, va phan
sach ki » sach kinh, sach bai, sach kem

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 tien thuoc bac ha phan thong ) or ( thuoc sach ki thuat toan hoa dan tong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tien thuoc bac ha phan thong ) OR ( thuoc sach ki thuat toan hoa dan tong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach tien thuoc bac ha phan thong ) or ( thuoc sach ki thuat toan hoa dan tong ))*.