Perhaps you should try some spelling variations:
su sach » so sach
vu sach » vu bach, vu khach
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ve bac » ve bao, ve cac, ve ban
bac so » bac son, bac si, bac bo
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho
so va » so van, so vat, su 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 (vu sach)) ky nang x hoi. hieu ve bac so va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky nang x hoi. hieu ve bac so va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky nang x hoi. hieu ve bac so va hanh vi cua tre*.