Perhaps you should try some spelling variations:
sach doi » sach hoi, sach moi, sach dao
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
tang ma » mang may, tang van
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

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 doi ((lang xa) or (tang ma)) hoi. hieu va cac xuc va ((ha noi) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi ((lang xa) OR (tang ma)) hoi. hieu va cac xuc va ((ha noi) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach doi ((lang xa) or (tang ma)) hoi. hieu va cac xuc va ((ha noi) or (hanh vi)) cua tre*.