Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
va nang » van nang, da nang, kha nang
hieu va » lieu va, hieu qua
xa hanh » xa thanh, xa khanh, va hanh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
va cam » va cham, va cac, va cao
xuc xa » tuc xa, buc xa

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

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