Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
van doanh » toan doanh, van dong, van thanh
va doanh » vay doanh, va danh, hoa doanh
hien cam » hien cac, hien cau, hien giam
thu sach » tu sach, thuat sach, thuoc sach
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
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 hien cam xuc ((va doanh) OR (van doanh)) dan cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky tang ((ma hoi) or (xa hoi)). dieu hien cam xuc ((va doanh) OR (van doanh)) dan cua tu~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky tang ((ma hoi) or (xa hoi)). dieu hien cam xuc ((va doanh) OR (van doanh)) dan cua tu*.