Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doanh van » doan van, doanh va, doanh ban
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
van cam » van nam, van lam, van cau
van cua » vang cua, ban cua, dan cua
bac va » ban va, bac ha, bao va

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) OR (toc sach)) ty lang xa hoi. hieu van cam ((bac va) or (duc va)) doanh van cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty lang xa hoi. hieu van cam ((bac va) OR (duc va)) doanh van cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty lang xa hoi. hieu van cam ((bac va) or (duc va)) doanh van cua triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ty lang xa hoi. hieu van cam ((bac va) or (duc va)) doanh van cua triet*.