Perhaps you should try some spelling variations:
dong hoa » dong hoc, dong co
khien tu » dien tu
thanh va » thanh van, hanh va, thanh ha
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky dong » ly dong, ky dang, ky cong
tu cham » toc cham, thi cham
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
va cua » va chua, via cua, ca cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky dong hoa hoc. khien tu cham ((xuc van) or (duc van)) thanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky dong hoa hoc. khien tu cham ((xuc van) OR (duc van)) thanh va cua te.
• Adding a wildcard symbol may retrieve word variants: so sach ky dong hoa hoc. khien tu cham ((xuc van) or (duc van)) thanh va cua te*.