Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, va danh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu va » hieu qua
xuc va » duc va, tuc va, luc va
co cua » con cua, cong cua, cuoi cua

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: vu sach ky dang xa hoi. ((hieu va) OR (lieu va)) cam xuc va doanh ((co cua) OR (ca cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky dang xa hoi. ((hieu va) or (lieu va)) cam xuc va doanh ((co cua) OR (ca cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: vu sach ky dang xa hoi. ((hieu va) or (lieu va)) cam xuc va doanh ((co cua) OR (ca cua)) tre*.