Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
toc sach » doc sach, thuoc sach, nuoc sach
cua viet » ca viet, hoa viet, cua vat
hoc sach » hoc sinh, hoc cac, hoc anh
xanh di » danh di, vanh dai, xanh tai
va xanh » va danh, va hanh, va anh
thuc va » thuc vat, thuc dan, thuc day
va nham » va cham, va tham, va nha
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
v nang » va nang, vu nang, van nang
x hoi » xa hoi, o hoi, x ho

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) or (hoc sach)) v nang x hoi. hieu va nham thuc va xanh di ((cua viet) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) v nang x hoi. hieu va nham thuc va xanh di ((cua viet) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) v nang x hoi. hieu va nham thuc va xanh di ((cua viet) or (cuu tre))*.