Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
dieu hien » dieu khien, dieu kien, bieu hien
thu sach » tu sach, thuat sach, thuoc sach
hien cam » hien cac, hien cau, hien giam
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
dan cua » dan ca, ban cua, dai cua
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua su, cua cu

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: thu sach ((ky tang) OR (ky dang)) ma hoi. dieu hien cam ((xuc va) OR (luc va)) doanh dan cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky tang) or (ky dang)) ma hoi. dieu hien cam ((xuc va) OR (luc va)) doanh dan cua tu~".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky tang) or (ky dang)) ma hoi. dieu hien cam ((xuc va) OR (luc va)) doanh dan cua tu*.