Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
thuat mach » thuat sach, thuat tach, thuyet mach
dat thuat » va thuat, cac thuat, dat thu
mach khoa » bach khoa, anh khoa, may khoa
pho thong » he thong
hoach dai » hoach dat, hoc dai, hoa dai
hanh khoa » hang khoa, anh khoa, hanh hoa
khoa khau » khoa kham, khoa phau, khoa chau
sach dat » sach dao, sach danh, sach bai
khoa pho » khoa phu, khoa khoa, khoa phau
thu hanh » thuc hanh, thu thanh, thuy hanh
tu sach » thu sach, su sach, te sach
dai thu » dai thua, dai thuc, doi thu

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