Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
phan luc » nhan luc, phan suc, than luc
va trien » va truyen, va thiet, va tuyen
van hanh » van thanh, ban hanh, van anh
phan duc » pham duc, phan tu, phan dau
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang x hoi. hieu van ((phan luc) OR (phan duc)) van hanh vi ((va trien) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x hoi. hieu van ((phan luc) OR (phan duc)) van hanh vi ((va trien) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang x hoi. hieu van ((phan luc) OR (phan duc)) van hanh vi ((va trien) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. hieu van ((phan luc) OR (phan duc)) van hanh vi ((va trien) or (su triet))*.