Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
hieu van » hieu va, thien van, lieu va
su sach » vu sach
cac tuc » cac toc, cac tu, cac tac
cua tre » cua te, cua triet, dua tren
xa hanh » xa thanh, xa khanh, va hanh
van cac » van hac, van cau, van bac
so sach » so sanh, bo sach, co sach
cuu tre » cau tren, cau treo
x hoi » xa hoi, o hoi, x ho

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