Perhaps you should try some spelling variations:
chat soc » cham soc, chat hoc, chat doc
su triet » su tien, ve triet
van nang » van quang, van ban, van dong
van hanh » van thanh, ban hanh, van anh
su sach » so sach
soc van » hoc van, oc van, sac van
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, vu khach
su viet » so viet

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) OR (vu sach)) van nang xa hoi. hieu ve chat soc van hanh vi ((su triet) OR (su viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) van nang xa hoi. hieu ve chat soc van hanh vi ((su triet) OR (su viet))~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) van nang xa hoi. hieu ve chat soc van hanh vi ((su triet) OR (su viet))*.