Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
va hanh » va thanh, va danh, ban hanh
sach ky » sac ky, sach y, sach kem
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua
va am » va lam, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) OR (sach ty)) lang xa hoi. hieu va am thuc ((va hanh) OR (van hanh)) di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach ty)) lang xa hoi. hieu va am thuc ((va hanh) OR (van hanh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach ty)) lang xa hoi. hieu va am thuc ((va hanh) OR (van hanh)) di cua tre*.