Perhaps you should try some spelling variations:
kham thong » khap thong, khau thong, pham thuong
khoa kham » kho khan, khoa than
thu thuoc » tu thuoc, thu thuc, tru thuoc
thuoc dac » thuoc dang, thuoc sach, thuc dan
pho thong » he thong
cach tri » cach thoi, cac tro, cach noi
tri thuc » tri tue
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
sach thu » sach thue, sach thieu, sach tham
dac khoa » da khoa, dai khoa, dau khoa
khoa pho » khoa phu, khoa khoa, khoa phau
tu cach » tu cac
su sach » so sach, vu sach

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cach tri thuc anh khoa kham thong ) OR ( su sach thu thuoc dac khoa pho thong ))~.
• Adding a wildcard symbol may retrieve word variants: (( tu cach tri thuc anh khoa kham thong ) or ( su sach thu thuoc dac khoa pho thong ))*.