Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
sach tu » sach thu, cach tu, sach ty
tai cua » thai cua, tai cuc, tri cua
thuc va » thuc vat, thuc dan, thuc day
truc va » thuc vat, trung va
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
dong ha » dong hoa, dong va, dong hoc
dong xa » dong xay, duong xa, dong va
cua tre » cua te, cuu tre, cua triet
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 tu ((dong xa) OR (dong ha)) 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 tu ((dong xa) OR (dong ha)) 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 tu ((dong xa) OR (dong ha)) hoi. hieu ve nam ((truc va) or (thuc va)) thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach tu ((dong xa) OR (dong ha)) hoi. hieu ve nam ((truc va) or (thuc va)) thanh tai cua tre*.