Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
dieu kien » dieu khien, dien bien
thu sach » tu sach, thuat sach, thuoc sach
kien cam » khien cau, trien cam, vien cac
va doanh » van doanh, vay doanh, va danh
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
dan cua » dan ca, ban cua, dai cua
ma hoi » mai hoi, ma hoa, me hoi
xuc va » duc va, tuc va, luc 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 ((ma hoi) OR (xa hoi)). dieu kien cam xuc va doanh dan cua tu~.
• Adding a wildcard symbol may retrieve word variants: thu sach ky tang ((ma hoi) or (xa hoi)). dieu kien cam xuc va doanh dan cua tu*.