Perhaps you should try some spelling variations:
bai thuoc » ban thuoc, bai hoc, cay thuoc
thuoc cac » thuoc cuc, thuoc cao, thuoc dac
hanh khoa » hang khoa, anh khoa, hanh hoa
cac khoa » cac khoan, cac khoi, dac khoa
sach nam » sach nay, sach tham, sach nang
thu hanh » thuc hanh, thu thanh, thuy hanh
khoa he » hoa he, khoa hoc, khong he
tu sach » thu sach, su sach, te sach
te cac » tu cac, ve cac, te cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te cac bai thuoc cac khoa he thong ) or ( tu sach nam thu hanh khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te cac bai thuoc cac khoa he thong ) OR ( tu sach nam thu hanh khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( te cac bai thuoc cac khoa he thong ) or ( tu sach nam thu hanh khoa he thong ))*.