Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doanh van » doan van, doanh va, doanh ban
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
van cam » van nam, van lam, van cau
lang xa » lang ha, lang van
van cua » vang cua, ban cua, dan cua
te sach » toc sach
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 ty ((lang xa) OR (dang xay)) 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 ty ((lang xa) OR (dang xay)) 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 ty ((lang xa) OR (dang xay)) hoi. hieu van cam ((bac va) or (duc va)) doanh van cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((lang xa) OR (dang xay)) hoi. hieu van cam ((bac va) or (duc va)) doanh van cua triet*.