Perhaps you should try some spelling variations:
khoan phau » khoa phau, khoan phai, khoa chau
phau thong » phap thong, khau thong, phan thong
tri trinh » tra trinh, thi trinh, tri tinh
trinh cac » trinh cau, trinh chat, trinh chao
hanh khoa » hang khoa, anh khoa, hanh hoa
pho thong » he thong
sach tri » sach tai, sach tren, sach truc
cach noi » cach thoi, hanh noi, anh noi
tuc hanh » thuc hanh, tuc thanh, duc hanh
khoa pho » khoa phu, khoa khoa, khoa phau
vu sach » vu bach, su sach, vu khach
tu cach » tu cac
noi tuc » noi thuc, loi tuc, noi luc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( vu sach tri trinh cac khoan phau thong ) or ( tu cach noi tuc hanh khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( vu sach tri trinh cac khoan phau thong ) OR ( tu cach noi tuc hanh khoa pho thong ))*.