Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (((toc sach) OR (hoc sach)))) ky nang xa hoi. hieu va cam xuc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (((toc sach) OR (hoc sach)))) ky nang xa hoi. hieu va cam xuc va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (((toc sach) OR (hoc sach)))) ky nang xa hoi. hieu va cam xuc va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (((toc sach) OR (hoc sach)))) ky nang xa hoi. hieu va cam xuc va hanh vai cua tre*.