Perhaps you should try some spelling variations:
cach khoan » cac khoan, cach hoan, bach khoa
khoan khau » khoanh khac, khoa kham, khoa phau
phan xuong » phan cong
thuc cach » thuoc sach, truoc cach, thuc hanh
khau tong » khau thong, khau cong, khau thuong
khoa phan » hoa phan, khoa than, khoa phau
bai thuc » bai thuoc, bao thuc, dai thuc
thu sach » tu sach, thuat sach, thuoc sach
sach tac » sach bac, sach tai, sach tham
cac khoa » cac khoan, cac khoi, dac khoa
tac hoc » trac hoc, toc hoc, bac hoc
hoc cac » hoc cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu cac bai thuc cach khoan khau tong ) or ( thu sach tac hoc cac khoa phan xuong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cac bai thuc cach khoan khau tong ) OR ( thu sach tac hoc cac khoa phan xuong )).
• Adding a wildcard symbol may retrieve word variants: (( tu cac bai thuc cach khoan khau tong ) or ( thu sach tac hoc cac khoa phan xuong ))*.