Perhaps you should try some spelling variations:
sach khuyen » sach chuyen, sach luyen
trien thuoc » trien thuc, trien thuong, tin thuoc
khuyen khoa » chuyen khoa, khuan khoa, chuyen hoa
hoach tren » hoach trong, hoach toan, hoc tren
danh khoan » doanh khoa, anh khoa, danh nhan
khoan phap » khoan phai, khoa phau, han phap
phap thong » phap phong, phap chong, pho thong
sach trien » sach tien, sach tren, sach thieu
thuoc sach » hoc sach, nuoc sach, thuat sach
khoa thong » hoa thong, thoai thong, pho thong
tren hoc » truyen hoc, trung hoc, triet hoc
hoc danh » hoc dan, hoc anh, hoc hanh
te sach » toc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu hoach tren hoc danh khoan phap thong ) or ( te sach trien thuoc sach khuyen khoa thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach tren hoc danh khoan phap thong ) OR ( te sach trien thuoc sach khuyen khoa thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu hoach tren hoc danh khoan phap thong ) or ( te sach trien thuoc sach khuyen khoa thong ))*.