Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
hieu van » hieu va, thien van, lieu va
danh dai » danh dau, danh di, danh sai
van tham » van thanh, van tuan, van chat
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
sach ky » sac ky, sach ty, sach kem
cua te » cua tu
ma hoi » mai hoi, xa hoi, me hoi

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 ky) or (sach y)) nang ((ma hoi) or (ma hoa)). hieu van tham thuc va danh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sach y)) nang ((ma hoi) OR (ma hoa)). hieu van tham thuc va danh dai cua te.
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (sach y)) nang ((ma hoi) or (ma hoa)). hieu van tham thuc va danh dai cua te*.