Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh di » thanh doi, thanh de, thanh do
va thanh » gia thanh, ban thanh, va tinh
hieu van » thien van, lieu va, hieu ve
thi nang » thi cong, ki nang, thi hanh
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
ty hang » ly hang, ty xang, thi hang
te sach » toc sach
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua
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 ((ty hang) or (thi nang)) x hoi. ((hieu van) OR (hieu va)) cac luc va thanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty hang) OR (thi nang)) x hoi. ((hieu van) OR (hieu va)) cac luc va thanh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty hang) or (thi nang)) x hoi. ((hieu van) OR (hieu va)) cac luc va thanh di cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty hang) or (thi nang)) x hoi. ((hieu van) OR (hieu va)) cac luc va thanh di cua triet*.