Perhaps you should try some spelling variations:
cac thue » cuc thue, cac thu, cach thuc
nang tai » hang tai, tang tai, sang tai
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
thue da » thue dat, thue va, thu da
da nang » cam nang, kha nang, cao nang
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
x hoi » o hoi, x ho, 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: tu sach y nang ((x hoi) or (xa hoi)). hieu va cac thue da nang tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((x hoi) OR (xa hoi)). hieu va cac thue da nang tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((x hoi) or (xa hoi)). hieu va cac thue da nang tai cua tre*.