Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
su bach » vu bach, su sach, huu bach
hieu ve » hieu va, hieu van
xuc ban » cuc ban, quoc ban, xuat ban
duc ban » duc tan, duc van, dua ban
hanh ki » hanh vi, hanh ky, hanh kien
ve cam » ve cham, ve cac, va cam
ki su » ky 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 ((tran quang) or (van ban)) xa hoi. hieu ve cam ((xuc ban) or (duc ban)) hanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su bach ((tran quang) OR (van ban)) xa hoi. hieu ve cam ((xuc ban) OR (duc ban)) hanh ki su triet.
• Adding a wildcard symbol may retrieve word variants: su bach ((tran quang) or (van ban)) xa hoi. hieu ve cam ((xuc ban) or (duc ban)) hanh ki su triet*.