Perhaps you should try some spelling variations:
van quang » van quan, tran quang, ban quan
su triet » su viet, su tien, ve triet
cac quoc » cac nuoc, cac cuoc, han quoc
ban hanh » ban hang
van tuan » van quan, van ban, anh tuan
cao quoc » cao thuoc, han quoc, cua quoc
su bach » vu bach, su sach, huu bach
hieu ve » hieu va, hieu van
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: su bach ((van quang) or (van tuan)) xa hoi. hieu ve ((cac quoc) OR (cao quoc)) ban hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su bach ((van quang) OR (van tuan)) xa hoi. hieu ve ((cac quoc) OR (cao quoc)) ban hanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su bach ((van quang) or (van tuan)) xa hoi. hieu ve ((cac quoc) OR (cao quoc)) ban hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: su bach ((van quang) or (van tuan)) xa hoi. hieu ve ((cac quoc) OR (cao quoc)) ban hanh vi su triet*.