Perhaps you should try some spelling variations:
sach tham » sach nha
van chat » cao chat
hanh vin » hanh tin, hanh van, thanh vien
chat xuc » chat huu, cam xuc, chao xu
hieu van » hieu va, thien van, lieu va
xuc van » duc van, luc van, vuc van
tu sach » thu sach, su sach, te sach
tang ma » tang van
cua tre » cua te, cuu tre, cua triet

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