Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cau luc » cau truc, cau phuc
cuu tre » cua tre, cau tren, cau treo
cam luc » cam xuc
hieu va » lieu va, hieu qua
cua te » cua tu
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 nang x hoi. hieu va ((cam luc) OR (cau 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 nang x hoi. hieu va ((cam luc) OR (cau 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 nang x hoi. hieu va ((cam luc) OR (cau luc)) van hanh vi ((cua te) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu va ((cam luc) OR (cau luc)) van hanh vi ((cua te) or (cuu tre))*.