Perhaps you should try some spelling variations:
ve triet » va trien, su triet
thuc day » thuc dan
danh dau » lanh dao, hang dau, danh tu
cua tre » cua te, cuu tre, cua triet
te sach » toc sach
sach vu » sach va, sach tu, sach uu
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
vu nang » vuc nang, va nang, vu dang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach vu nang ma hoa. hieu va tham ((thuc day) OR (thuc vat)) danh dau ((cua tre) OR (ve triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach vu nang ma hoa. hieu va tham ((thuc day) OR (thuc vat)) danh dau ((cua tre) or (ve triet))~".
• Adding a wildcard symbol may retrieve word variants: te sach vu nang ma hoa. hieu va tham ((thuc day) OR (thuc vat)) danh dau ((cua tre) or (ve triet))*.