Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
danh dau » lanh dao, hang dau, danh tu
su triet » su viet, su tien, ve triet
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve tham » va tham, ve cham, vi tham
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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