Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nha thuoc, cay thuoc
dang xay » dang van, van xay
so sach » so sanh, co sach, hoc sach
bo sach » co sach, hoc sach
dinh te » kinh te, dich te, dinh ve
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
va dinh » van dinh, va kinh, va tinh
te cua » tue cua, le cua, de cua
y dang » ky dang, 2 dang, _ dang
cua te » cua tu

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