Perhaps you should try some spelling variations:
van nang » van quang, van dong, van dung
su triet » su viet, su tien, ve triet
tu bach » vu bach, tu cach, tu bac
hieu ve » hieu va, hieu van
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
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: tu bach ((van nang) or (van ban)) xa hoi. hieu ve cam ((luc van) OR (duc van)) hanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bach ((van nang) OR (van ban)) xa hoi. hieu ve cam ((luc van) OR (duc van)) hanh ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bach ((van nang) or (van ban)) xa hoi. hieu ve cam ((luc van) OR (duc van)) hanh ki su triet".
• Adding a wildcard symbol may retrieve word variants: tu bach ((van nang) or (van ban)) xa hoi. hieu ve cam ((luc van) OR (duc van)) hanh ki su triet*.