Perhaps you should try some spelling variations:
thanh soc » thanh son, thanh hoc, thanh ngoc
nhanh soc » nganh soc, nhanh doc, nhanh song
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
hanh di » hanh vi, hanh de, hang di
te sach » toc sach
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) OR (nhanh soc)) van hanh 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) OR (nhanh soc)) van hanh 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) OR (nhanh soc)) van hanh di su triet*".