Perhaps you should try some spelling variations:
thuc doanh » thuc hanh, thuc dan, chuc danh
doanh khoa » toan khoa
thuoc sach » hoc sach, nuoc sach, thuat sach
phap thong » phap phong, phap chong, pho thong
hoc thong » hoc thuong, hoc trong, hoc hong
cao thuoc » cay thuoc, cua thuoc, nam thuoc
sach khoa » bach khoa, sach nha, anh khoa
khoa phap » khoa phau, khoan phai, khong phap
hoach do » hoach de, hoach du, hoach hoi
khoa hoc » hoa hoc
sach cao » sach dao, sach cap, mach cao
do thuc » hoc thuc, dan thuc
su sach » so sach, vu sach

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: (( thu hoach do thuc doanh khoa hoc thong ) OR ( su sach cao thuoc sach khoa phap thong ))~.
• Adding a wildcard symbol may retrieve word variants: (( thu hoach do thuc doanh khoa hoc thong ) or ( su sach cao thuoc sach khoa phap thong ))*.