Perhaps you should try some spelling variations:
dang xay » dang van, van xay
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
qua cau » quan cau, qua cac, qua ca
cau loc » hau loc, cau hoc, cau luc
danh vi » dinh vi, danh di, danh va
loc va » hoc va, luc va
thiet » thieu

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: su sach ky dang xay hoi. hieu qua cau loc va ((danh vi) OR (hanh vi)) va thiet~.
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xay hoi. hieu qua cau loc va ((danh vi) or (hanh vi)) va thiet*.