Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
va triet » va thiet, va trien, ve triet
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
hau duc » huu duc, ha duc, pham duc
van hau » van ha, van hai, van dau
tu sach » thu sach, su sach, tu cach
te sach » toc sach
lap va » tap va
co hoi » co hoc, co loi
o hoi » o hoc, o hai, o hoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang ((o hoi) OR (co hoi)). hieu van hau duc va thanh lap va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ky nang ((o hoi) or (co hoi)). hieu van hau duc va thanh lap va triet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ky nang ((o hoi) or (co hoi)). hieu van hau duc va thanh lap va triet*.