Perhaps you should try some spelling variations:
cao duc » dao duc, cao suc, tao duoc
vai cua » dai cua, hai cua, lai cua
anh vai » anh va, anh bai, anh van
van anh » van thanh, tuan anh, van minh
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky

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

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