Perhaps you should try some spelling variations:
vu sach » vu bach, vu khach
su sach » so sach
hieu va » lieu va, hieu qua
cau duc » cao duc, cau luc, chu duc
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cuu tre » cua tre, cau tren, cau treo
va cau » van cau, va cac, va dau
vi cuu » vi luu, vinh cuu
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky nang x hoi. hieu va cau duc va danh vi cuu tre~.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky nang x hoi. hieu va cau duc va danh vi cuu tre*.