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
nang xa » nang x, lang xa, nang ma
va giao » van giao, va gia, ve giao
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, v nang

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 xa hoi. hieu ((va giao) OR (va giai)) 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 xa hoi. hieu ((va giao) OR (va giai)) 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 xa hoi. hieu ((va giao) OR (va giai)) duc ban hanh vi ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu ((va giao) OR (va giai)) duc ban hanh vi ((cua tre) or (cua triet))*.