Perhaps you should try some spelling variations:
tham thuoc » pham thuoc, tham thuc, nha thuoc
thuoc sach » hoc sach, nuoc sach, thuat sach
khoa khong » khoi khong, hoa khong, khon khong
sach tham » sach nha
phuc thuc » thuc thuc, hoc thuc, phap thuc
thuc cach » truoc cach, thuc hanh, tuc cac
khe khong » he khong, khoi khong, khon khong
sach hoa » sach ha, sach hoi, bach hoa
hoa khoa » khoa khoa, chua khoa, chia khoa
cach hoc » cach thuc, cach thoi, dich hoc
tu sach » thu sach, su sach, te sach
tu hanh » du hanh, lu hanh, thuc hanh
hoc khe » hoc he, hoc khi, hoc phe

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 sach hoa khoa khong ) or ( tu hanh phuc thuc cach hoc khe khong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tham thuoc sach hoa khoa khong ) OR ( tu hanh phuc thuc cach hoc khe khong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tham thuoc sach hoa khoa khong ) or ( tu hanh phuc thuc cach hoc khe khong ))*.