Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
va danh » va dinh, va dan, va hanh
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ve su » va su
kien » bien, vien, tien

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 ve) or (hieu van)) nam thuc ((van hanh) or (va danh)) ve su kien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang xa hoi. ((hieu ve) OR (hieu van)) nam thuc ((van hanh) OR (va danh)) ve su kien.
• Adding a wildcard symbol may retrieve word variants: su sac ky nang xa hoi. ((hieu ve) or (hieu van)) nam thuc ((van hanh) or (va danh)) ve su kien*.