Perhaps you should try some spelling variations:
phap thong » phap phong, phap chong, pho thong
thuoc bach » thuoc sach, thuoc ban, truc bach
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » cac khoa, cac khoan, anh khoa
hoc thong » hoc thuong, hoc trong, hoc hong
hoach cua » hoach luan, hoc cua, doanh cua
cua thuoc » nha thuoc, cay thuoc, cua nuoc
bach khoa » anh khoa
khoa phap » khoa phau, khoan phai, khong phap
khoa hoc » hoa hoc
vu sach » vu bach, su sach, vu khach

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: (( vu sach tren thuc cach khoa hoc thong ) OR ( thu hoach cua thuoc bach khoa phap thong ))~.
• Adding a wildcard symbol may retrieve word variants: (( vu sach tren thuc cach khoa hoc thong ) or ( thu hoach cua thuoc bach khoa phap thong ))*.