Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh dai » trinh dai, tinh da, tinh hai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
van bao » van ban, van dao
va tinh » may tinh
co hai » co dai, co hoi, so hai
o hai » so hai, o lai, _ hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((o hai) or (co hai)). hieu ((van cau) or (van bao)) duc va tinh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hai) OR (co hai)). hieu ((van cau) OR (van bao)) duc va tinh dai cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hai) or (co hai)). hieu ((van cau) or (van bao)) duc va tinh dai cua triet*.