Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
dieu cua » dieu tra
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
va dau » va dao
ca dan » cac dan, ca dao
x hoi » xa hoi, o hoi, x ho

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 x hoi. lieu va cac nuoc ((va dau) or (ca dan)) dieu cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. lieu va cac nuoc ((va dau) OR (ca dan)) dieu cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. lieu va cac nuoc ((va dau) or (ca dan)) dieu cua tre*.