Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
vu nang » vuc nang, vu dang, v nang
va nang » van nang, da nang, kha nang
hieu va » lieu va, hieu qua
dao xuc » dao duc, dao tuc, dao xu
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, cua triet
va dao » ca dao
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: su sach ((vu nang) or (((va nang) OR (cam nang)))) xa hoi. hieu va dao xuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((vu nang) OR (((va nang) OR (cam nang)))) xa hoi. hieu va dao xuc van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((vu nang) or (((va nang) OR (cam nang)))) xa hoi. hieu va dao xuc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((vu nang) or (((va nang) OR (cam nang)))) xa hoi. hieu va dao xuc van hanh vi cua tre*.