Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
dinh sai » dinh tai, danh sai, dinh hai
va dinh » van dinh, va kinh, va tinh
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
hieu va » lieu va, hieu qua
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 ((ty nang) OR (ty hang)) co hoi. hieu va am thuc va dinh sai ((cua triet) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ty hang)) co hoi. hieu va am thuc va dinh sai ((cua triet) or (va triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ty hang)) co hoi. hieu va am thuc va dinh sai ((cua triet) or (va triet))*.