Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cua triet » su triet, va triet
thanh de » hanh de, thanh ve, thanh do
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
cua tre » cua te, cuu tre, dua tren
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: te sach ky nang o hoi. lieu va cam luc van thanh de ((cua tre) or (((cua triet) OR (cua viet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang o hoi. lieu va cam luc van thanh de ((cua tre) OR (((cua triet) OR (cua viet)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang o hoi. lieu va cam luc van thanh de ((cua tre) or (((cua triet) OR (cua viet))))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang o hoi. lieu va cam luc van thanh de ((cua tre) or (((cua triet) OR (cua viet))))*.