Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
so sach » so sanh, co sach, hoc sach
tai cua » thai cua, tai cuc, tri cua
thuc va » thuc vat, thuc dan, thuc day
truc va » thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ty dang » ty xang, ky dang, ty hang
bo sach » co sach, hoc sach
ve nam » he nam, va nam, le nam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) OR (bo sach)) ty dang xa hoi. hieu ve nam ((truc va) or (thuc va)) thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) ty dang xa hoi. hieu ve nam ((truc va) OR (thuc va)) thanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (bo sach)) ty dang xa hoi. hieu ve nam ((truc va) or (thuc va)) thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (bo sach)) ty dang xa hoi. hieu ve nam ((truc va) or (thuc va)) thanh tai cua tre*.