Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
su sach » so sach, vu sach
van lam » van nam
lam xuc » cam xuc, lam duoc
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cuu tre, cua triet
cu tren » tu tren, dua tren
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, 5 hoi

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 y nang ((x hoi) OR (x ho)). hieu van lam xuc ban hanh vi ((cua tre) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((x hoi) OR (x ho)). hieu van lam xuc ban hanh vi ((cua tre) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((x hoi) OR (x ho)). hieu van lam xuc ban hanh vi ((cua tre) or (cu tren))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((x hoi) OR (x ho)). hieu van lam xuc ban hanh vi ((cua tre) or (cu tren))*.