Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
thuat mach » thuat sach, thuat tach, thuyet mach
dai thuat » dai thua, giai thuat, ki thuat
mach khoa » bach khoa, may khoa, moc khoa
pho thong » he thong
khoa khau » khoa kham, khoa phau, khoa chau
sach dai » sach dao, sach bai, sach dat
khoa pho » khoa phu, khoa khoa, khoa phau
dao thuc » dan thuc, dao tuc, do thuc
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
te sach » toc sach
te lanh » te danh, te lan, tu lanh

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 dai thuat mach khoa pho thong ) or ( te lanh dao thuc anh khoa khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach dai thuat mach khoa pho thong ) OR ( te lanh dao thuc anh khoa khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach dai thuat mach khoa pho thong ) or ( te lanh dao thuc anh khoa khau thong ))*.