Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
cuu tre » cua tre, cau tren, cau treo
xanh di » vanh dai, xanh tai
sach ty » sach y, sach tu, sach thu
te sach » toc sach
hieu va » lieu va, hieu qua
ty hang » ly hang, ty xang, thi hang
danh di » danh du, danh dien, danh gia
va hoi » xa hoi, va hoc, va hoa

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 ty hang va hoi. hieu va cac nuoc va ((danh di) or (xanh di)) ((cuu tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty hang va hoi. hieu va cac nuoc va ((danh di) OR (xanh di)) ((cuu tre) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: te sach ty hang va hoi. hieu va cac nuoc va ((danh di) or (xanh di)) ((cuu tre) or (va triet))*.