Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cuu tre » cau tren, cau treo
va cam » va cham, va cac, va cai
luc va » duc va, tuc va, loc va
va cao » va cac, va co, va dao
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) OR (va cao)) luc va hanh vi ((cua tre) 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) OR (va cao)) luc va hanh vi ((cua tre) 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) OR (va cao)) luc va hanh vi ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu ((va cam) OR (va cao)) luc va hanh vi ((cua tre) or (cuu tre))*.