Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
su triet » su viet, su tien, ve triet
te sach » toc sach
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
cac luc » cau luc, coc luc, cac nuoc
va hanh » van hanh, va thanh, va danh
luc va » duc va, tuc va, loc va
tai su » tai so, tai tu, lai 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 van)) hoi. hieu van cac luc va hanh tai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang xa) OR (lang van)) hoi. hieu van cac luc va hanh tai su triet.
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang xa) or (lang van)) hoi. hieu van cac luc va hanh tai su triet*.