Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van ban
dang xay » dang van, van xay
so sach » so sanh, bo sach, co sach
van anh » van thanh, tuan anh, van minh
cam duc » cam xuc, cao duc, pham duc
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
mang xa » lang xa, mang may, mang cua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky ((mang xa) or (dang xay)) hoi. hieu va cam duc ((van hanh) or (van anh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((mang xa) OR (dang xay)) hoi. hieu va cam duc ((van hanh) OR (van anh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky ((mang xa) or (dang xay)) hoi. hieu va cam duc ((van hanh) or (van anh)) vi cua tre*.