Perhaps you should try some spelling variations:
duong sach » duong manh
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cuu tre » cau tren, cau treo
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
cam tu » cam thu, nam tu, dam 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: duong sach ty nang x hoi. hieu ve ((cam tu) or (cam xuc)) va hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: duong sach ty nang x hoi. hieu ve ((cam tu) OR (cam xuc)) va hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: duong sach ty nang x hoi. hieu ve ((cam tu) or (cam xuc)) va hanh vi ((cua tre) or (cuu tre))*.