Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
vu sach » vu bach, su sach, vu khach
so sanh » do sanh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
bac tuc » bac tu, bach tuoc, bac thua
tuc van » thuc van, truc van, tuc va
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van nang
va bac » van bac, va cac, va bai
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 (so sanh)) v nang xa hoi. hieu va bac tuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sanh)) v nang xa hoi. hieu va bac tuc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sanh)) v nang xa hoi. hieu va bac tuc van hanh vi cua tre*.