Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
dieu tra » dieu tri, kiem tra, dieu cua
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
tra tre » tran tren, tran tri, tran tro
va dao » ca dao
ca dan » cac dan, ca dao

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