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