Perhaps you should try some spelling variations:
hieu vien » hieu hien, thieu nien, hieu tieng
cua triet » cua viet, su triet
hieu viec » nhieu viec, hieu ve, sieu viet
va triet » va thiet, va trien, ve triet
va hanh » van hanh, va thanh, va danh
hanh ca » hanh cac, hanh cat, hanh cua
cac luc » cau luc, coc luc, cac nuoc
nang xa » nang x, lang xa, nang ma
luc va » duc va, tuc va, loc va
sac ky » cac ky, sai ky
su sac » su sach, su cac, su xac

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 nang xa hoi. ((hieu vien) or (hieu viec)) cac luc va hanh ca ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang xa hoi. ((hieu vien) OR (hieu viec)) cac luc va hanh ca ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang xa hoi. ((hieu vien) or (hieu viec)) cac luc va hanh ca ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang xa hoi. ((hieu vien) or (hieu viec)) cac luc va hanh ca ((cua triet) OR (va triet))*.