Perhaps you should try some spelling variations:
phap thong » phap phong, phap chong, pho thong
cach khoa » bach khoa, cac khoa, cac khoan
khoa phap » khoa phau, khoan phai, khong phap
hanh thoi » hanh thuoc, nhanh thai, hanh noi
phu thong » pho thong, khau thong, phan thong
sach vai » sach bai, sach va, sach tai
tro cach » tho cach, trong cach, truoc cach
cach tai » cac tai, cach ta, sach tai
tai thuc » thai thuc, tri thuc, dai thuc
thoi phu » thi phu, hoi phu, thon phu
su sach » so sach, vu sach
tu cach » tu cac

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 vai tro cach khoa phap thong ) or ( tu cach tai thuc hanh thoi phu thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach vai tro cach khoa phap thong ) OR ( tu cach tai thuc hanh thoi phu thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach vai tro cach khoa phap thong ) or ( tu cach tai thuc hanh thoi phu thong ))*.