Perhaps you should try some spelling variations:
su sach » so sach, vu sach
ky tang » ky dang, kho tang, ky trong
qua cau » quan cau, qua cac, qua ca
cau loc » hau loc, cau hoc, cau luc
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
loc va » hoc va, luc va
vi va » vi van, vai va, vu 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 tang) OR (ky nang)) xa hoi. hieu qua cau loc va danh vi va thiet~.
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) or (ky nang)) xa hoi. hieu qua cau loc va danh vi va thiet*.