Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
va tinh » may tinh
va dinh » van dinh, va kinh, vu dinh
so sach » so sanh, co sach, hoc sach
hieu ke » hieu kem, chieu ke, hieu ky
xay hoi » xa hoi, tay hoi, cay phoi
bo sach » co sach, hoc sach
te cua » tue cua, le cua, de cua
cua te » cua tu
y van » ly van, ty van, _ van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (bo sach)) y van xay hoi. hieu ke nha thuoc ((va dinh) OR (va tinh)) te cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) y van xay hoi. hieu ke nha thuoc ((va dinh) OR (va tinh)) te cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (bo sach)) y van xay hoi. hieu ke nha thuoc ((va dinh) OR (va tinh)) te cua te".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (bo sach)) y van xay hoi. hieu ke nha thuoc ((va dinh) OR (va tinh)) te cua te*.