Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh vai » danh va, doanh van, dang van
danh sai » dung sai, danh bat, danh dau
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
y nang » ly nang, v nang, may nang
co hoi » co hoc, co loi
va am » va lam, va cam

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 ((y nang) OR (ky nang)) co hoi. hieu va am thuc va ((danh vai) OR (danh sai)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ky nang)) co hoi. hieu va am thuc va ((danh vai) or (danh sai)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (ky nang)) co hoi. hieu va am thuc va ((danh vai) or (danh sai)) cua triet*.