Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
sach kho » bach khoa, sach dao, sach nha
kho tang » cao tang
tang lai » trang lai, tang tai, tang loi
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
tu sach » thu sach, su sach, te sach
lai hoi » dai hoi, lai hoa, lai roi
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach kho tang lai hoi. hieu van cham thuc va hanh ((dai cua) or (day cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach kho tang lai hoi. hieu van cham thuc va hanh ((dai cua) OR (day cua)) triet.
• Adding a wildcard symbol may retrieve word variants: tu sach kho tang lai hoi. hieu van cham thuc va hanh ((dai cua) or (day cua)) triet*.