Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
hanh thai » hinh thai, hanh tai, anh thai
xuc ban » duc ban, cuc ban, quoc ban
cac xuc » cam xuc, cac nuoc, chat xuc
sach ty » sach tu, sach thu, xach tay
hieu va » lieu va, hieu qua
nang so » nang som, nang co, nang ho
cua tre » cua te, cuu tre, cua triet
so hai » son hai, su hai, so ha

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 ty) OR (sach y)) nang so hai. hieu va cac xuc ban ((hanh thai) or (nhanh thai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang so hai. hieu va cac xuc ban ((hanh thai) OR (nhanh thai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach y)) nang so hai. hieu va cac xuc ban ((hanh thai) or (nhanh thai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach y)) nang so hai. hieu va cac xuc ban ((hanh thai) or (nhanh thai)) cua tre*.