Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
hieu van » hieu va, thien van, lieu va
su triet » su viet, ve triet
thi hanh » thi thanh
va thanh » gia thanh, ban thanh, va tinh
van coc » van hoc, van loc, van co
te sach » toc sach
ty hang » ly hang, ty xang, thi hang
su tien » su kien, su hien, tu tieng
luc va » duc va, tuc va, loc va
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 hanh)) x hoi. hieu van coc luc va thanh dai ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty hang) OR (thi hanh)) x hoi. hieu van coc luc va thanh dai ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty hang) or (thi hanh)) x hoi. hieu van coc luc va thanh dai ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty hang) or (thi hanh)) x hoi. hieu van coc luc va thanh dai ((su triet) OR (su tien))*.