Perhaps you should try some spelling variations:
van quang » van quan, tran quang, ban quan
van tuan » van quan, van ban, anh tuan
ban hanh » ban hang
su triet » su viet, ve triet
su bach » vu bach, su sach, huu bach
hieu ve » hieu va, hieu van
xuc ban » duc ban, cuc ban, quoc ban
su tien » su kien, su hien, tu tieng
ve cam » ve cham, ve cac, va cam

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