Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
te sach » toc sach
ty lang » tay lang, ty hang, tu lang
van cam » van nam, van lam, van cau
bac va » ban va, bac ha, bao va
van su » dan 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 ((ty lang) or (ty xang)) xa hoi. hieu van cam ((bac va) or (duc va)) doanh van su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty lang) OR (ty xang)) xa hoi. hieu van cam ((bac va) OR (duc va)) doanh van su triet.
• Adding a wildcard symbol may retrieve word variants: te sach ((ty lang) or (ty xang)) xa hoi. hieu van cam ((bac va) or (duc va)) doanh van su triet*.