Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh doi » thanh doi, hanh noi, hang doi
va triet » va thiet, va trien, ve triet
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
van cac » van hac, van cau, van bac
cac luc » cau luc, coc luc, cac nuoc
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky lang xa hoi. hieu van cac luc va ((hanh doi) or (huong dan)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky lang xa hoi. hieu van cac luc va ((hanh doi) OR (huong dan)) va triet.
• Adding a wildcard symbol may retrieve word variants: su sac ky lang xa hoi. hieu van cac luc va ((hanh doi) or (huong dan)) va triet*.