Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
ly nang » ky nang, ly hang, ly vang
hanh di » hanh vi, hanh de, hang di
y nang » ky nang, v nang, may nang
xac va » tac va, ac va, bac va
di cua » dai cua, doi cua, de 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: te sach ((y nang) or (ly nang)) x hoi. hieu van nam ((xac va) or (duc va)) hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (ly nang)) x hoi. hieu van nam ((xac va) OR (duc va)) hanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (ly nang)) x hoi. hieu van nam ((xac va) or (duc va)) hanh di cua viet*.