Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
nang xa » nang x, lang xa, nang ma
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky

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