Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
va thanh » gia thanh, ban thanh, va tinh
thanh te » thanh ve, thanh de, thanh le
bo sach » co sach, hoc sach
va khai » van khai, va khao, va kha
y nang » ky nang, ly nang, v nang
va hai » van hai, va chai, va bai
te cua » tue cua, le cua, de cua
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach y nang ((x hoi) or (x ho)). lieu ((va hai) OR (va khai)) duc va thanh te cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach y nang ((x hoi) OR (x ho)). lieu ((va hai) OR (va khai)) duc va thanh te cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach y nang ((x hoi) or (x ho)). lieu ((va hai) OR (va khai)) duc va thanh te cua triet".
• Adding a wildcard symbol may retrieve word variants: bo sach y nang ((x hoi) or (x ho)). lieu ((va hai) OR (va khai)) duc va thanh te cua triet*.