Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
van tham » van thanh, van tuan, van chat
hieu van » hieu va, thien van, lieu va
nang dai » nang dau, nang tai, lang dai
dai hai » dai han, dai hoi, dai tai
vu sach » vu bach, su sach, vu khach
soc van » hoc van, sac van, soc dan
te sach » toc sach
oc van » hoc van, luoc van, quoc van
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (vu sach)) ky nang dai hai. hieu van tham ((soc van) OR (oc van)) hanh vi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (vu sach)) ky nang dai hai. hieu van tham ((soc van) OR (oc van)) hanh vi cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu sach)) ky nang dai hai. hieu van tham ((soc van) OR (oc van)) hanh vi cua viet*.