Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc va » thuc va, thuoc ma, thuong va
so sach » so sanh, co sach, hoc sach
bo sach » co sach, hoc sach
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
dinh te » dich te, dinh ve, dinh tu
ve nam » he nam, va nam, le nam
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 ve nam thuoc va ((dinh te) OR (kinh 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 ve nam thuoc va ((dinh te) OR (kinh 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 ve nam thuoc va ((dinh te) OR (kinh te)) cua te".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (bo sach)) y van xay hoi. hieu ve nam thuoc va ((dinh te) OR (kinh te)) cua te*.