Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, xuc ban
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
lang xa » lang ha, dang xay, lang van
mang xa » mang may, dang xay, mang cua
di cua » dai cua, doi cua, de cua

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 ((mang xa) or (lang xa)) hoi. ((hieu ve) OR (hieu van)) cam xuc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((mang xa) OR (lang xa)) hoi. ((hieu ve) OR (hieu van)) cam xuc van hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((mang xa) or (lang xa)) hoi. ((hieu ve) OR (hieu van)) cam xuc van hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((mang xa) or (lang xa)) hoi. ((hieu ve) OR (hieu van)) cam xuc van hanh di cua tre*.