Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
toc sach » hoc sach, doc sach, thuoc sach
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
ve cam » ve cham, ve cac, va cam
vi cuu » vi luu, vinh cuu
o hoi » co hoi, o hoc, o hai

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 (toc sach)) ky nang ((o hoi) OR (xa hoi)). hieu ve cam duc van hanh vi cuu tre~.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky nang ((o hoi) or (xa hoi)). hieu ve cam duc van hanh vi cuu tre*.