Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
nam tuc » nam thuc, nam truc, nam tu
xa hanh » xa thanh, xa khanh, va hanh
cuu tre » cua tre, cau tren
va nam » van nam, ha nam, va nay

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 (mang may)) hoi. hieu va nam tuc xa hanh vi ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang ma) OR (mang may)) hoi. hieu va nam tuc xa hanh vi ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang ma) or (mang may)) hoi. hieu va nam tuc xa hanh vi ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang ma) or (mang may)) hoi. hieu va nam tuc xa hanh vi ((cuu tre) OR (cau treo))*.