Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van tuan » van quan, van ban, anh tuan
tuan san » luan san, tan san, thanh san
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
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
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao
o hoi » co hoi, o hoc, o hai

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 o hoi. hieu va cam luc van tuan san ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang o hoi. hieu va cam luc van tuan san ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang o hoi. hieu va cam luc van tuan san ((cua tre) or (cua triet))*.