Perhaps you should try some spelling variations:
dang xay » dang van, van xay
cuu tre » cau tren, cau treo
va tinh » may tinh
cua tre » cua te, cua triet, dua tren
va dinh » van dinh, va kinh, vu dinh
cao duc » dao duc, cao suc, giao duc
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
va cao » va cac, va co, va dao
tu sac » tu sach, tu cac, tu san

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky dang xay hoi. hieu va cao duc ((va dinh) OR (va tinh)) vai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang xay hoi. hieu va cao duc ((va dinh) OR (va tinh)) vai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky dang xay hoi. hieu va cao duc ((va dinh) OR (va tinh)) vai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang xay hoi. hieu va cao duc ((va dinh) OR (va tinh)) vai ((cua tre) or (cuu tre))*.