Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh va » thanh van, hanh va, thanh ha
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
cac duc » cac du, cac dac, cac nuoc
cao duc » dao duc, cao suc, giao duc
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) OR (sach y)) nang xa hoi. lieu va ((cac duc) or (cao duc)) van thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang xa hoi. lieu va ((cac duc) OR (cao duc)) van thanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach y)) nang xa hoi. lieu va ((cac duc) or (cao duc)) van thanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach y)) nang xa hoi. lieu va ((cac duc) or (cao duc)) van thanh va cua tre*.