Perhaps you should try some spelling variations:
duong sac » duong sach, duong san, duong cac
hieu ve » hieu va, hieu van
cam tuc » cam tu, nam thuc, dam thuc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
sac ky » cac ky, sai ky
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 sac ky nang x hoi. hieu ve ((cam tuc) 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 sac ky nang x hoi. hieu ve ((cam tuc) OR (cam xuc)) va hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: duong sac ky nang x hoi. hieu ve ((cam tuc) or (cam xuc)) va hanh vi ((cua tre) or (cuu tre))*.