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
cam luc » cam xuc
cau luc » cau truc, cau phuc
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) OR (cau 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) OR (cau luc)) van hanh ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bach ((van dong) or (van ban)) xa hoi. hieu van ((cam luc) OR (cau 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) OR (cau luc)) van hanh ki su triet*.