Perhaps you should try some spelling variations:
hieu viec » nhieu viec, sieu viet, hieu hien
sach nuoc » sach duoc, cac nuoc, bach tuoc
dong cua » dung cua, cong cua, huong cua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
doi cua » dai cua, hoi cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang xa hoi. ((hieu viec) or (hieu ve)) sach nuoc va danh ((doi cua) OR (dong cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((hieu viec) OR (hieu ve)) sach nuoc va danh ((doi cua) OR (dong cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. ((hieu viec) or (hieu ve)) sach nuoc va danh ((doi cua) OR (dong cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. ((hieu viec) or (hieu ve)) sach nuoc va danh ((doi cua) OR (dong cua)) tre*.