Perhaps you should try some spelling variations:
cach khuan » cac khoan, cach hoan
khan thong » khap thong, khau thong, nhan thong
khoa thong » hoa thong, thoai thong, pho thong
thuc cach » thuoc sach, truoc cach, thuc hanh
cach thuc » anh thuc, cac thu
thuc thuy » thuc thuc, thu thuy, thac thuy
thuy cach » thuy canh, thuy anh, tu cach
nha thuc » nhan thuc, nha thuoc, nham thuc
cach kho » bach khoa, cach thoi, cach pha
kho khan » khoa kham, khoa than
su sach » so sach, vu sach
te cach » ve cach, te sach, tu cach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach nha thuc cach kho khan thong ) or ( te cach thuc thuy cach khuan khoa thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach nha thuc cach kho khan thong ) OR ( te cach thuc thuy cach khuan khoa thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach nha thuc cach kho khan thong ) or ( te cach thuc thuy cach khuan khoa thong ))*.