Perhaps you should try some spelling variations:
sach nuoc » sach duoc, cac nuoc, bach tuoc
thanh doi » thanh loi, thanh moi, thanh do
hieu viec » nhieu viec, sieu viet, hieu hien
danh doi » danh di, dung doi, danh hoa
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet

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 ty nang xa hoi. ((hieu viec) or (hieu ve)) sach nuoc va ((danh doi) or (thanh doi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. ((hieu viec) OR (hieu ve)) sach nuoc va ((danh doi) OR (thanh doi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. ((hieu viec) or (hieu ve)) sach nuoc va ((danh doi) or (thanh doi)) cua tre*.