Perhaps you should try some spelling variations:
hieu viec » nhieu viec, sieu viet, hieu hien
sach nuoc » sach duoc, cac nuoc, bach tuoc
danh hoi » danh hoa, dan hoi, danh hoc
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
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 viec) OR (((hieu ve) OR (hieu va)))) sach nuoc va danh hoi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang xa hoi. ((hieu viec) OR (((hieu ve) OR (hieu va)))) sach nuoc va danh hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang xa hoi. ((hieu viec) OR (((hieu ve) OR (hieu va)))) sach nuoc va danh hoi cua tre*.