Perhaps you should try some spelling variations:
khoan phap » khoan phai, khoa phau, han phap
phap chong » phap phong, phap cong, pham hong
sach thai » sach tham, sac thai, sach tai
thai thuc » thai thuy, thai tuc, tham thuc
canh tam » canh tac, canh tay, hanh tam
tam thuc » tham thuc, am thuc, nam thuc
thuc cac » thuc cach, tuc cac, phuc cac
khoan he » khoa he, khoan ke, khoan le
so canh » so sanh, bo canh, so danh
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: (( so canh tam thuc cac khoan he thong ) or ( so sach thai thuc cac khoan phap chong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so canh tam thuc cac khoan he thong ) OR ( so sach thai thuc cac khoan phap chong )).
• Adding a wildcard symbol may retrieve word variants: (( so canh tam thuc cac khoan he thong ) or ( so sach thai thuc cac khoan phap chong ))*.