Perhaps you should try some spelling variations:
duong sach » duong manh
cuon sach » cuoc cach, co sach, nuoc sach
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
cuu tre » cau tren, cau treo
hieu ve » hieu va, hieu van
tuc va » thuc va, truc va, tuc xa
ve cam » ve cham, ve cac, va cam
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: ((cuon sach) or (duong sach)) ky nang x hoi. hieu ve cam tuc va hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((cuon sach) OR (duong sach)) ky nang x hoi. hieu ve cam tuc va hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((cuon sach) or (duong sach)) ky nang x hoi. hieu ve cam tuc va hanh vi ((cua tre) or (cuu tre))*.