Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
tay lang » tai lang, tay tang, tay quang
lang hoa » hang hoa, lang ha, nang hoa
hanh vai » hanh vi, hanh va, hanh tai
sach tay » xach tay, sach hay, sach nay
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
hieu ve » hieu van
hoa hoi » khoa hoi, hoa hoc, hoa doi

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 tay lang hoa hoi. ((hieu ve) or (hieu va)) cau thuc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tay lang hoa hoi. ((hieu ve) OR (hieu va)) cau thuc va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach tay lang hoa hoi. ((hieu ve) or (hieu va)) cau thuc va hanh vai cua tre*.