Perhaps you should try some spelling variations:
kho tang » cao tang
va trien » va truyen, va thiet, va tuyen
su sach » so sach, vu sach
ky tang » ky nang, ky dang, 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 vu » danh tu, anh vu, danh du
loc va » hoc va, luc va
vu va » vu van, tu va, su va

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky tang) OR (kho tang)) xa hoi. hieu qua cau loc va danh vu va trien~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) OR (kho tang)) xa hoi. hieu qua cau loc va danh vu va trien*.