Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cac thu » cach thuc, cac thoi
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
cac tu » cach tu, cac du, tac tu
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu ve ((cac tu) OR (cac thu)) va hanh vi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x hoi. hieu ve ((cac tu) OR (cac thu)) va hanh vi cua viet*".