Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua dieu
thanh de » hanh de, thanh ve, thanh do
duc ban » duc tan, duc van, duc man
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
va cham » va chat, va tham
dua ban » dia ban, cua ban, qua ban
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky dang xa hoi. hieu va cham ((duc ban) OR (dua ban)) thanh de ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky dang xa hoi. hieu va cham ((duc ban) OR (dua ban)) thanh de ((cua viet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky dang xa hoi. hieu va cham ((duc ban) OR (dua ban)) thanh de ((cua viet) or (cua vat))".
• Adding a wildcard symbol may retrieve word variants: tu san ky dang xa hoi. hieu va cham ((duc ban) OR (dua ban)) thanh de ((cua viet) or (cua vat))*.