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

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) OR (so sanh)) ky dong hoa hoc. hien tu cham ((xuc van) or (duc van)) thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) ky dong hoa hoc. hien tu cham ((xuc van) OR (duc van)) thanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (so sanh)) ky dong hoa hoc. hien tu cham ((xuc van) or (duc van)) thanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (so sanh)) ky dong hoa hoc. hien tu cham ((xuc van) or (duc van)) thanh va cua tre*.