Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
doanh dan » doanh ban, doanh van, doanh dao
hien giam » khien giam, nien giam, thien giap
va doanh » van doanh, vay doanh, va danh
giam xuc » gian xu, gia muc, cam xuc
thu sach » tu sach, thuat sach, thuoc sach
kho tang » cao tang
ky tang » ky nang, ky dang, ky trong
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, luc va
cua tu » cua tuc, cua cu, cua te
cua su » qua su

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