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
van hanh » ban hanh, van anh, van minh
su triet » su viet, su tien, ve triet
te sach » toc sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
di su » doi su, ki su, da su

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) OR (van ban)) di 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) OR (van ban)) di 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) OR (van ban)) di su triet*".