Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
tu bach » vu bach, tu cach, tu bac
van cam » van nam, van lam, van cau
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
hanh ki » hanh vi, hanh ky, hanh kien
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 dong) or (van ban)) xa hoi. hieu van cam luc van hanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bach ((van dong) OR (van ban)) xa hoi. hieu van cam luc van hanh ki su triet.
• Adding a wildcard symbol may retrieve word variants: tu bach ((van dong) or (van ban)) xa hoi. hieu van cam luc van hanh ki su triet*.