Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
khoan phau » khoa phau, khoan phai, khoa chau
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoa, anh khoa
khoa khau » khoa kham, khoa phau, khoa chau
hach dien » mach dien, nhanh dien, dich dien
dien thuc » kien thuc, den thuc, diem thuc
phau phan » phap phan, chau phan, phan phan
sach bai » sach dao, cac bai, sach xa
bai thuc » bai thuoc, bao thuc, dai thuc
thuc cac » tuc cac, phuc cac, thac cac
su sach » so sach, vu sach
tu hach » tu hanh, tu cach, tu sach

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 bai thuc cach khoa khau thong ) or ( tu hach dien thuc cac khoan phau phan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach bai thuc cach khoa khau thong ) OR ( tu hach dien thuc cac khoan phau phan ))*.