Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
dang mau » dong mau, dang van, dang su
cam thuc » am thuc, nam thuc, cam thu
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
van cam » van nam, van lam, van cau
te sach » toc sach
sach ky » sac ky, sach y, sach ty
dang ma » dang mam, dang mat, tang ma
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: te sach ky ((dang ma) or (dang mau)) hoa. hieu van cam thuc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((dang ma) OR (dang mau)) hoa. hieu van cam thuc va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((dang ma) or (dang mau)) hoa. hieu van cam thuc va hanh vai cua tre*.