Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
va triet » va thiet, va trien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
ky dang » ky nang, ky danh
cau luc » cau phuc
ky lang » ky nang, ky tang, tay lang
su sach » so sach, vu sach
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 quan ((cau luc) OR (cau truc)) va thanh vi va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky lang) or (ky dang)) xa hoi. hieu quan ((cau luc) OR (cau truc)) va thanh vi va triet~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky lang) or (ky dang)) xa hoi. hieu quan ((cau luc) OR (cau truc)) va thanh vi va triet*.