Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
co sach » bo sach, cuon sach, hoc sach
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, xuc ban
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam
x hoi » o hoi, x ho, 5 hoi

You may be able to get more results by adjusting your search query.

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