Perhaps you should try some spelling variations:
khoan phau » khoa phau, khoan phai, khoa chau
phau thong » phap thong, khau thong, phan thong
cach thoi » cac thoi, cach thuc, cach noi
hanh khoa » hang khoa, anh khoa, hanh hoa
pho thong » he thong
sach tri » sach tai, sach tren, sach truc
tri tinh » tri kinh, trieu tinh, thai tinh
tinh cac » tinh cach, trinh cac, tich cac
thoi tuc » thai tuc, choi thuc, thu tuc
tuc hanh » thuc hanh, tuc thanh, duc hanh
khoa pho » khoa phu, khoa khoa, khoa phau
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 tri tinh cac khoan phau thong ) or ( tu cach thoi tuc hanh khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tri tinh cac khoan phau thong ) OR ( tu cach thoi tuc hanh khoa pho thong ))*.