Perhaps you should try some spelling variations:
tham thuoc » pham thuoc, tham thuc, nha thuoc
khang khoa » hang khoa, khang kho, khong khoa
phan thong » phan thuong, phan hong, phan tong
sach tham » sach nha
khoa phan » hoa phan, khoa than, khoa phau
sach giai » sach giao, cac giai, sach bai
giai khat » giai phap, giai phau
hoc thong » hoc thuong, hoc trong, hoc hong
khat anh » nhat anh, nhat hanh, phat hanh
anh khoa » doanh khoa, hang khoa
khoa hoc » hoa hoc
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach tham thuoc khang khoa phan thong ) or ( tu sach giai khat anh khoa hoc thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tham thuoc khang khoa phan thong ) OR ( tu sach giai khat anh khoa hoc thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tham thuoc khang khoa phan thong ) or ( tu sach giai khat anh khoa hoc thong ))*.