Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
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 va » lieu va, hieu qua
va hanh » va thanh, va danh, ban hanh
su tien » su kien, su hien, tu tieng
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
vi su » va su, ve su, ki su

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