Perhaps you should try some spelling variations:
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
hanh khoa » hang khoa, anh khoa, hanh hoa
pho thong » he thong
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc ban » thuoc tan, thuoc dang, thu ban
hoc thong » hoc thuong, hoc trong, hoc hong
khoa pho » khoa phu, khoa khoa, khoa phau
sach nam » sach nay, sach nang, sach ngan
ban khoa » san khoa, van khoa, ba khoa
khoa hoc » hoa hoc
te sach » toc sach
tu sach » thu sach, su sach, tu cach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach tham thuc hanh khoa pho thong ) or ( tu sach nam thuoc ban khoa hoc thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tham thuc hanh khoa pho thong ) OR ( tu sach nam thuoc ban khoa hoc thong ))*.