Perhaps you should try some spelling variations:
kham thong » khap thong, khau thong, pham thuong
can khoan » cac khoan, toan khoan, san khoa
khoan hoi » khoan nhoi, khoa hoi, khoa hoc
hoi trong » choi trong, doi trong, nuoi trong
khoa kham » kho khan, khoa than
thuc can » thuc chan, thuc dan, thuc van
can khoa » san khoa, con khoa, van khoa
so sach » so sanh, bo sach, co sach
sach tu » sach thu, cach tu, sach ty
tu thuc » tu thuoc, thu thuc, tu thu
vu sach » vu bach, su sach, vu khach

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: (( so sach tu thuc can khoan hoi trong ) OR ( vu sach tu thuc can khoa kham thong ))~.
• Adding a wildcard symbol may retrieve word variants: (( so sach tu thuc can khoan hoi trong ) or ( vu sach tu thuc can khoa kham thong ))*.