Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
toc sach » hoc sach, doc sach, thuoc sach
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
v nang » va nang, vu nang, van nang
vi cuu » vi luu, vinh cuu
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) OR (toc sach)) v nang x hoi. hieu ve ((cau luc) or (cam xuc)) van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) v nang x hoi. hieu ve ((cau luc) OR (cam xuc)) van hanh vi cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) v nang x hoi. hieu ve ((cau luc) or (cam xuc)) van hanh vi cuu tre*".