Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, mang may
hieu va » lieu va
nam tuc » nam thuc, nam truc, nam tu
xa hanh » xa thanh, xa khanh, va hanh
cua tre » cua te, cuu tre, cua triet
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: te sach ky ((nang ma) OR (nang cao)) hoi. ((hieu va) or (hieu qua)) nam tuc xa hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang ma) OR (nang cao)) hoi. ((hieu va) OR (hieu qua)) nam tuc xa hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang ma) OR (nang cao)) hoi. ((hieu va) or (hieu qua)) nam tuc xa hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang ma) OR (nang cao)) hoi. ((hieu va) or (hieu qua)) nam tuc xa hanh vi cua tre*.