Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
cua tre » cua te, cua triet, dua tren
hanh di » hanh vi, hanh de, hang di
tuc van » thuc van, truc van, tuc va
cam tuc » cam xuc, cam tu, nam thuc
cuu tre » cau tren, cau treo
va cam » va cham, va cac, va cao

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 tu ((nang x) or (nang cao)) hoi. lieu va cam tuc van hanh di ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ((nang x) OR (nang cao)) hoi. lieu va cam tuc van hanh di ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: te sach tu ((nang x) or (nang cao)) hoi. lieu va cam tuc van hanh di ((cua tre) or (cuu tre))*.