Perhaps you should try some spelling variations:
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
sach ky » sac ky, sach y, sach kem
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
vi cua » vai cua, di cua
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: te ((sach ky) OR (sach ty)) nang x hoi. hieu va cam xuc ((va hanh) or (va danh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach ty)) nang x hoi. hieu va cam xuc ((va hanh) OR (va danh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach ty)) nang x hoi. hieu va cam xuc ((va hanh) or (va danh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach ty)) nang x hoi. hieu va cam xuc ((va hanh) or (va danh)) vi cua tre*.