Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doanh van » doan van, doanh va, doanh ban
sach thi » sach thu, sach tai, sach thieu
thanh xa » thanh ha, thanh va, thanh ba
danh vai » danh sai, danh va, dang van
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
hanh va » hang va, hanh vi
ve am » va am

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thi ((thanh xa) or (hanh va)) hoi. hieu ve am thuc va ((danh vai) OR (doanh van)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thi ((thanh xa) OR (hanh va)) hoi. hieu ve am thuc va ((danh vai) OR (doanh van)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thi ((thanh xa) or (hanh va)) hoi. hieu ve am thuc va ((danh vai) OR (doanh van)) cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach thi ((thanh xa) or (hanh va)) hoi. hieu ve am thuc va ((danh vai) OR (doanh van)) cua triet*.