Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh soc » thanh son, nhanh soc, thanh hoc
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
lang xa » lang ha, dang xay, lang van
soc van » hoc van, oc van, sac van
nang xa » nang x, nang ma, mang xa
hanh di » hanh de, hang di, danh di
te sach » toc sach

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 y ((nang xa) or (lang xa)) hoi. hieu van thanh soc van ((hanh di) OR (hanh vi)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang xa) OR (lang xa)) hoi. hieu van thanh soc van ((hanh di) OR (hanh vi)) su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang xa) or (lang xa)) hoi. hieu van thanh soc van ((hanh di) OR (hanh vi)) su triet*".