Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dieu hien » dieu khien, dieu kien, bieu hien
doanh dan » doanh ban, doanh van, doanh dao
hien cam » hien cac, hien cau, hien giam
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
dan cua » dan ca, ban cua, dai cua
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 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: thuat sach ky tang ma hoi. dieu hien cam ((xuc va) OR (tuc va)) doanh dan cua su~.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky tang ma hoi. dieu hien cam ((xuc va) or (tuc va)) doanh dan cua su*.