Perhaps you should try some spelling variations:
sach nuoc » sach duoc, cac nuoc, bach tuoc
hieu viec » nhieu viec, sieu viet, hieu hien
danh hoi » danh hoa, dan hoi, danh hoc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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