Perhaps you should try some spelling variations:
sach dao » lanh dao
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cua triet, dua tren
dinh di » dinh du, dinh vi, danh di
va dinh » van dinh, va kinh, va tinh
cuu tre » cau tren, cau treo
hieu va » lieu va, hieu qua
sach v » sach va, sach y, sach 2
va cam » va cham, va cac, va cao
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: toc ((sach v) or (sach dao)) nang x hoi. hieu va cam duc va dinh di ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach v) OR (sach dao)) nang x hoi. hieu va cam duc va dinh di ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: toc ((sach v) or (sach dao)) nang x hoi. hieu va cam duc va dinh di ((cua tre) or (cuu tre))*.