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
tang ma » mang may, tang van
dan cua » dan ca, ban cua, dai cua
y tang » ky tang, 6 tang, 7 tang
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
cua cu » cua chu, cua cau, cua 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 y tang ma hoi. dieu hien cam ((xuc va) OR (tuc va)) doanh dan cua cu~.
• Adding a wildcard symbol may retrieve word variants: thu sach y tang ma hoi. dieu hien cam ((xuc va) or (tuc va)) doanh dan cua cu*.