Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
phat xuc » chat xuc, phat xuat, phap xu
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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 (doc sach)) ky nang x ho. hieu va phat xuc ((va hanh) or (va danh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (doc sach)) ky nang x ho. hieu va phat xuc ((va hanh) OR (va danh)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (doc sach)) ky nang x ho. hieu va phat xuc ((va hanh) or (va danh)) di cua tre*.