Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
tang ma » mang may, tang van
dao duc » giao duc, tao duoc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang ma » sang ma, nang cao, mang may
sac ky » cac ky, sai ky
va dao » ca dao
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sac ky) or (sach y)) ((nang ma) OR (tang ma)) hoi. hieu va dao duc va thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sac ky) OR (sach y)) ((nang ma) OR (tang ma)) hoi. hieu va dao duc va thanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sac ky) or (sach y)) ((nang ma) OR (tang ma)) hoi. hieu va dao duc va thanh vi cua tre*".