Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
thu sach » tu sach, thuat sach, thuoc sach
cham xuc » cam xuc, chat xuc, cham soc
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc sach) or (thu sach)) ky ((nang xa) or (nang x)) hoi. hieu ve cham xuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (thu sach)) ky ((nang xa) OR (nang x)) hoi. hieu ve cham xuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (thu sach)) ky ((nang xa) or (nang x)) hoi. hieu ve cham xuc va hanh vi cua tre*.