Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh lam » trinh lam, dinh lam, tinh lao
tu sach » thu sach, su sach, te sach
ly nang » ly hang, ly vang, ly quang
van cau » van dau, van chat, toan cau
van hau » van ha, van hai, van dau
va tinh » may tinh
lam cua » nam cua, lam chat
o hoi » co hoi, o hoc, o 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 ((ly nang) or (ky nang)) o hoi. hieu ((van cau) OR (van hau)) duc va tinh lam cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly nang) OR (ky nang)) o hoi. hieu ((van cau) OR (van hau)) duc va tinh lam cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ly nang) or (ky nang)) o hoi. hieu ((van cau) OR (van hau)) duc va tinh lam cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly nang) or (ky nang)) o hoi. hieu ((van cau) OR (van hau)) duc va tinh lam cua triet*.