Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
duc van » duc va, duc tan, duc manh
cuu tre » cua tre, cau tren, cau treo
su sach » so sach, vu sach
ve cac » va cac, vien cac
vi cuu » vi luu, vinh cuu
ve cam » ve cham, va cam, ve cai
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: ((te sach) OR (su sach)) ky nang x hoi. hieu ((ve cam) OR (ve cac)) duc van hanh vi cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (su sach)) ky nang x hoi. hieu ((ve cam) OR (ve cac)) duc van hanh vi cuu tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (su sach)) ky nang x hoi. hieu ((ve cam) OR (ve cac)) duc van hanh vi cuu tre*.