Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach, vu khach
van cam » van nam, van lam, van cau
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
cua tre » cua te, cuu tre, dua tren
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: vu sach y nang ((x hoi) or (xa hoi)). hieu van cam luc van thanh san ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang ((x hoi) OR (xa hoi)). hieu van cam luc van thanh san ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: vu sach y nang ((x hoi) or (xa hoi)). hieu van cam luc van thanh san ((cua tre) or (cua triet))*.