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

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