Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
cua tre » cua te, cuu tre, cua triet
vai cua » dai cua, hai cua, lai cua
cac tac » cac toc, cac bac, cac dac
cac tuc » cac toc, cac tu, cac nuoc
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
su sac » su cac, su xac

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: ((su sac) OR (su sach)) ky lang xa hoi. hieu va ((cac tuc) OR (cac tac)) ban hanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) or (su sach)) ky lang xa hoi. hieu va ((cac tuc) OR (cac tac)) ban hanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su sach)) ky lang xa hoi. hieu va ((cac tuc) OR (cac tac)) ban hanh vai cua tre*.