Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va hanh » va thanh, va danh, ban hanh
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, 5 hoi

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