Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
luc van » luoc van, luu van, duc van
cam luc » cam xuc, cau luc
sach ky » sac ky, sach ty, sach kem
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
cua te » cua tu
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho

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