Perhaps you should try some spelling variations:
hieu viec » nhieu viec, sieu viet, hieu hien
sach nuoc » sach duoc, cac nuoc, bach tuoc
danh doi » danh di, thanh doi, dung doi
vu sach » vu bach, su sach, vu khach
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
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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

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