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

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) OR (chat doc)) van hanh vi su triet~.
• 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) OR (chat doc)) van hanh vi su triet~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) van nang xa hoi. hieu ve ((chat soc) OR (chat doc)) van hanh vi su triet*.