Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
tu cach » tu cac
su sach » so sach, vu sach
van cam » van nam, van lam, van cau
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (su sach)) y nang ((x ho) or (o hoi)). hieu van cam xuc va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) y nang ((x ho) OR (o hoi)). hieu van cam xuc va hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) y nang ((x ho) or (o hoi)). hieu van cam xuc va hanh vi cua viet*.