Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
thuat mach » thuat sach, thuat tach, thuyet mach
mach khoa » bach khoa, may khoa, moc khoa
pho thong » he thong
hoach dai » hoach dat, hoc dai, hoa dai
khoa khau » khoa kham, khoa phau, khoa chau
va thuat » ky thuat, ki thuat, va thuc
khoa pho » khoa phu, khoa khoa, khoa phau
dai thuc » dan thuc, dai thu, dai thua
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
tu sach » thu sach, su sach, te sach
sach va » sach xa, sach ha, sach dao

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 va thuat mach khoa pho thong ) or ( thu hoach dai thuc anh khoa khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach va thuat mach khoa pho thong ) OR ( thu hoach dai thuc anh khoa khau thong ))*.