Perhaps you should try some spelling variations:
phap thong » phap phong, phap chong, pho thong
thuoc sach » hoc sach, nuoc sach, thuat sach
khoan khoa » khuan khoa, khoa khoa, toan khoa
khoa thong » hoa thong, thoai thong, pho thong
cach thoi » cac thoi, cach thuc, cach noi
khoa phap » khoa phau, khoan phai, khong phap
thoi tuc » thai tuc, choi thuc, thu tuc
dac khoa » da khoa, dai khoa, dau khoa
sach tri » sach tai, sach tren, sach truc
tu cach » tu cac
tuc dac » tuc cac, tuc dan, thuoc dac
tue cac » tu cac, tuc cac, te cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu cach thoi tuc dac khoa phap thong ) or ( thuoc sach tri tue cac khoan khoa thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cach thoi tuc dac khoa phap thong ) OR ( thuoc sach tri tue cac khoan khoa thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu cach thoi tuc dac khoa phap thong ) or ( thuoc sach tri tue cac khoan khoa thong ))*.