Perhaps you should try some spelling variations:
khoa thong » hoa thong, thoai thong, pho thong
sach trien » sach tien, sach tren, sach thieu
trien thuc » trien thuoc, tren thuc, trien thuat
khoan khoi » khoan hoi, khoan nhoi, khoang thoi
khoi phong » khoi khong, khi phong, hai phong
thuc cach » thuoc sach, truoc cach, thuc hanh
bach bai » bach mai, sach bai, cac bai
bai thuc » bai thuoc, bao thuc, dai thuc
cach hoa » cach hoan, cach hoc, bach hoa
hoa khoa » khoa khoa, chua khoa, chia khoa
thuc cac » tuc cac, phuc cac, thac cac
so sach » so sanh, bo sach, co sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( vu bach bai thuc cach hoa khoa thong ) or ( so sach trien thuc cac khoan khoi phong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( vu bach bai thuc cach hoa khoa thong ) OR ( so sach trien thuc cac khoan khoi phong ))*.