Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh te » thanh ve, thanh de, thanh le
hieu va » lieu va, hieu qua
te sach » toc sach
va nang » van nang, da nang, cam nang
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
v nang » vu nang, van nang, voi nang
te cua » tue cua, le cua, de cua
va cao » va cac, va co, va dao
x hoi » xa hoi, o hoi, x ho

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 ((v nang) OR (va nang)) x hoi. hieu va cao ((luc va) or (tuc va)) thanh te cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((v nang) OR (va nang)) x hoi. hieu va cao ((luc va) OR (tuc va)) thanh te cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((v nang) OR (va nang)) x hoi. hieu va cao ((luc va) or (tuc va)) thanh te cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((v nang) OR (va nang)) x hoi. hieu va cao ((luc va) or (tuc va)) thanh te cua triet*.