Perhaps you should try some spelling variations:
dong hoa » dong co
dong hoc » dong co, dong luc
hieu tuc » hieu thuc, hieu luc, hieu thuoc
tuc cham » toc cham, tu cham, phuc cham
cham xuc » cam xuc, chat xuc, cham soc
van hanh » van thanh, ban hanh, van anh
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
xuc van » duc van, luc van, vuc van
hanh va » hang va, hanh vi
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 ky ((dong hoa) or (dong hoc)) hoi. hieu tuc cham xuc van hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((dong hoa) OR (dong hoc)) hoi. hieu tuc cham xuc van hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky ((dong hoa) or (dong hoc)) hoi. hieu tuc cham xuc van hanh va cua tre*.