Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
thanh vi » hanh vi, thanh va, thanh ve
qua cau » quan cau, qua cac, qua ca
su sach » so sach, vu sach
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
luc va » duc va, tuc va
loc va » hoc va
vi va » vi van, vai va, vu va

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