Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
dang xay » dang van, van xay
va hanh » van hanh, va thanh, va danh
hai cuc » tai cuc, hai cua, thai cua
bo sach » co sach, hoc sach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
hoc cac » hoc cao
qua hai » qua hoat
cuc va » chuc va, duc va, cuu va

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: ((bo sach) OR (hoc cac)) ky dang xay hoi. hieu qua hai cuc va hanh vi ((cua triet) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bo sach) or (hoc cac)) ky dang xay hoi. hieu qua hai cuc va hanh vi ((cua triet) OR (va triet))~".
• Adding a wildcard symbol may retrieve word variants: ((bo sach) or (hoc cac)) ky dang xay hoi. hieu qua hai cuc va hanh vi ((cua triet) OR (va triet))*.