Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
cac truc » cau truc, cac tru, cac trung
vu sach » vu khach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
su sach » so sach
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
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 (vu bach))) or (su sach)) ky lang xa hoi. hieu ve cac truc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((vu sach) OR (vu bach))) OR (su sach)) ky lang xa hoi. hieu ve cac truc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((vu sach) or (vu bach))) or (su sach)) ky lang xa hoi. hieu ve cac truc van hanh vi cua tre*.