Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
lam luc » lam duoc
sach ty » sach y, sach tu, sach thu
lao luc » bao luc
hanh va » hanh vi

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty lang xa hoi. hieu van ((lam luc) OR (lao luc)) va ((hanh va) OR (hang va)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty lang xa hoi. hieu van ((lam luc) OR (lao luc)) va ((hanh va) or (hang va)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: toc sach ty lang xa hoi. hieu van ((lam luc) OR (lao luc)) va ((hanh va) or (hang va)) cua triet*.