Perhaps you should try some spelling variations:
van quang » van quan, tran quang, ban quan
van tuan » van quan, van ban, anh tuan
cac quoc » cac nuoc, cac cuoc, cao quoc
quoc ban » quoc bao, quoc lan, quoc quan
ban hanh » ban hang
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
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 sach ((van quang) or (van tuan)) xa hoi. hieu va cac quoc ban hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((van quang) OR (van tuan)) xa hoi. hieu va cac quoc ban hanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: su sach ((van quang) or (van tuan)) xa hoi. hieu va cac quoc ban hanh vi su triet*.