Perhaps you should try some spelling variations:
kham thong » khap thong, khau thong, pham thuong
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoa, cac khoan
hoc thong » hoc thuong, hoc trong, hoc hong
khoa kham » kho khan, khoa than
xach dao » sach dao, lanh dao, sach dat
dao thuc » dan thuc, dao tuc, do thuc
khoa hoc » hoa hoc
xac thai » rac thai, sac thai, xa thai
thai tuc » thai thuc, thai thuy, thai hoc
anh khoa » doanh khoa, hang khoa
su xach » su sach
tuc anh » tuc hanh, duc anh, tu anh
su xac » pu xac, su cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su xach dao thuc cach khoa hoc thong ) or ( su xac thai tuc anh khoa kham thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su xach dao thuc cach khoa hoc thong ) OR ( su xac thai tuc anh khoa kham thong )).
• Adding a wildcard symbol may retrieve word variants: (( su xach dao thuc cach khoa hoc thong ) or ( su xac thai tuc anh khoa kham thong ))*.