Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va danh, ban hanh
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
song xa » song cua
sang xa » lang xa, sang ma, mang xa
ve cam » ve cham, ve cac, 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 ((sang xa) OR (song xa)) hoi. hieu ve cam xuc ((va hanh) or (va thanh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((sang xa) OR (song xa)) hoi. hieu ve cam xuc ((va hanh) OR (va thanh)) hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((sang xa) OR (song xa)) hoi. hieu ve cam xuc ((va hanh) or (va thanh)) hai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((sang xa) OR (song xa)) hoi. hieu ve cam xuc ((va hanh) or (va thanh)) hai cua tre*.