Perhaps you should try some spelling variations:
cao suc » cao su, cao duc
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
dao duc » giao duc, tao duoc
cua tre » cua te, cuu tre, cua triet
va anh » van anh, va danh, va hanh
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di cua
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: thuat ((sach ky) or (sach y)) nang x hoi. hieu ve ((dao duc) or (cao suc)) va anh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ky) OR (sach y)) nang x hoi. hieu ve ((dao duc) OR (cao suc)) va anh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ky) or (sach y)) nang x hoi. hieu ve ((dao duc) or (cao suc)) va anh vi cua tre*.