Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
dao duc » giao duc, tao duoc
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
va dao » ca dao

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 ((y nang) OR (v nang)) xa hoi. hieu va dao duc ban hanh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) xa hoi. hieu va dao duc ban hanh vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (v nang)) xa hoi. hieu va dao duc ban hanh vi ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (v nang)) xa hoi. hieu va dao duc ban hanh vi ((cua tre) or (cua triet))*.