Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
dao duc » giao duc, tao duoc
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, mang xa
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: thuat ((sach ty) OR (sach thu)) ((nang xa) or (nang ma)) hoi. hieu van dao duc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ty) OR (sach thu)) ((nang xa) OR (nang ma)) hoi. hieu van dao duc va hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ty) OR (sach thu)) ((nang xa) or (nang ma)) hoi. hieu van dao duc va hanh vi cua tre*".