Perhaps you should try some spelling variations:
khoan pho » khoan nhoi, khoan phai, khoan hoi
pho thong » he thong
sach thuc » cach thuc, sach thu, sach thue
thuc thuc » hoc thuc
khoa phap » khoa phau, khoan phai, khong phap
sach tri » sach tai, sach tren, sach truc
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
su sach » so sach, vu sach
tu sach » thu sach, te sach, tu cach
tri te » tri tue, tri le, tri ve
te cac » tu cac, ve cac, te cao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tri te cac khoan pho thong ) OR ( tu sach thuc thuc anh khoa phap tieng ))~.
• Adding a wildcard symbol may retrieve word variants: (( su sach tri te cac khoan pho thong ) or ( tu sach thuc thuc anh khoa phap tieng ))*.