Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh hai » thanh phan, thanh hoa, thanh san
thi hang » thi hanh, thi hong, thi thanh
thi nang » thi cong, ki nang, thi hanh
hieu van » hieu va, thien van, lieu va
hai cua » thai cua, dai cua, hoi cua
te sach » toc sach
van coc » van hoc, van loc, van co
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
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 ((thi hang) or (thi nang)) x hoi. hieu van coc ((luc va) OR (tuc va)) thanh hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((thi hang) OR (thi nang)) x hoi. hieu van coc ((luc va) OR (tuc va)) thanh hai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((thi hang) or (thi nang)) x hoi. hieu van coc ((luc va) OR (tuc va)) thanh hai cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((thi hang) or (thi nang)) x hoi. hieu van coc ((luc va) OR (tuc va)) thanh hai cua triet*.