Perhaps you should try some spelling variations:
thuoc toan » thuoc tan, thuoc thanh, thuat toan
cua thuoc » nha thuoc, cay thuoc, cua nuoc
thuoc ban » thuoc tan, thuoc dang, thu ban
mach cua » manh cua, menh cua, hanh cua
ban khoa » san khoa, van khoa, ba khoa
khoa pho » khoa phu, khoa khoa, khoa phau
thu sach » tu sach, thuat sach, thuoc sach
tu thuoc » truc thuoc, tu thuong, tin thuoc
su mach » su sach
sach tu » sach thu, cach tu, sach ty
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 mach cua thuoc ban khoa pho thong ) or ( thu sach tu thuoc toan khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su mach cua thuoc ban khoa pho thong ) OR ( thu sach tu thuoc toan khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( su mach cua thuoc ban khoa pho thong ) or ( thu sach tu thuoc toan khoa he thong ))*.