Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
hoc sach » hoc sinh, hoc cac, hoc anh
thuoc va » thuc va, thuoc ma, thuong va
bo sach » co sach
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
va dinh » van dinh, va kinh, va tinh
dinh de » dinh ve, dinh du, dinh le
ve nam » he nam, va nam, le nam
de cua » le cua, te cua, dieu 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: ((bo sach) or (hoc sach)) y van xay hoi. hieu ve nam thuoc va dinh de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((bo sach) OR (hoc sach)) y van xay hoi. hieu ve nam thuoc va dinh de cua te.
• Adding a wildcard symbol may retrieve word variants: ((bo sach) or (hoc sach)) y van xay hoi. hieu ve nam thuoc va dinh de cua te*.