Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
chua tre » chua tri, cua tre, chua trieu
thanh va » thanh van, hanh va, thanh ha
thi cham » thi hai, toc cham, thi hao
dong hoa » dong hoc, dong co
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky dong » ly dong, ky dang, ky cong
xuc van » duc van, luc van, vuc van
co sach » bo sach, cuon sach, hoc sach
va chua » vua chua, ca chua, va chu
so sach » so sanh, bo sach, hoc sach
thi ha » thi hai, thi hanh

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