Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh de » hanh de, thanh ve, thanh do
hieu va » lieu va, hieu qua
te sach » toc sach
sach v » sach va, sach y, sach 2
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
v nang » va nang, vu nang, van nang
de cua » le cua, te cua, dieu cua
va cao » va cac, va co, va dao
o hoi » co hoi, o hoc, o hai
x hoi » xa 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: te sach v nang ((x hoi) OR (o hoi)). hieu va cao ((luc va) or (tuc va)) thanh de cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang ((x hoi) OR (o hoi)). hieu va cao ((luc va) OR (tuc va)) thanh de cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v nang ((x hoi) OR (o hoi)). hieu va cao ((luc va) or (tuc va)) thanh de cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach v nang ((x hoi) OR (o hoi)). hieu va cao ((luc va) or (tuc va)) thanh de cua triet*.