Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thuc day » thuc dan, thuc vat
hanh vai » hanh vi, hanh tai, hanh van
hieu van » hieu va, thien van, lieu va
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc dan
van cam » van nam, van lam, van cau
danh ma » anh ma, danh ca, hanh ma
ty danh » ty doanh, ty anh, ky danh

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty danh ma hoa. hieu van cam ((thuc va) or (thuc day)) ((hanh vai) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty danh ma hoa. hieu van cam ((thuc va) OR (thuc day)) ((hanh vai) OR (hanh va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty danh ma hoa. hieu van cam ((thuc va) or (thuc day)) ((hanh vai) or (hanh va)) cua tre*.