Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
vu sach » vu bach, vu khach
su sach » so sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cac tuc » cac toc, cac tu, cac tac
tuc van » thuc van, truc van, tuc va
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (su sach)) ky lang xa hoi. lieu va cac tuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky lang xa hoi. lieu va cac tuc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky lang xa hoi. lieu va cac tuc van hanh vi cua tre*.