Perhaps you should try some spelling variations:
doanh co » doanh cua, doanh va, anh co
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
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
co cua » con cua, ca cua, cong 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) OR (tuc va)) doanh co 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) OR (tuc va)) doanh co cua tre~".
• Adding a wildcard symbol may retrieve word variants: vu sach ky dang xa hoi. ((hieu va) or (lieu va)) cam ((xuc va) OR (tuc va)) doanh co cua tre*.