Perhaps you should try some spelling variations:
chat triet » chet triet, phat trien, chat thien
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
hanh cad » hanh cac, hanh cat, hanh cap
cad chat » cao chat, cac chat, van chat
sach lo » sach dao, sach doi, sach hoi
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
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: toc sach lo ((nang ma) or (sang ma)) hoi. hieu van nam thuc va hanh cad chat triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach lo ((nang ma) OR (sang ma)) hoi. hieu van nam thuc va hanh cad chat triet*.