Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
hanh khoa » hang khoa, anh khoa, hanh hoa
bach khoa » anh khoa
khoa pho » khoa phu, khoa khoa, khoa phau
nha truc » nha thuoc, nha tu, ba truc
su sach » so sach, vu sach
te sach » toc sach
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 thuc hanh khoa pho thong ) or ( te sach nha truc bach khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tham thuc hanh khoa pho thong ) OR ( te sach nha truc bach khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach tham thuc hanh khoa pho thong ) or ( te sach nha truc bach khoa he thong ))*.