Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dieu cua » dieu tra
dang xay » dang van, van xay
nam thuc » nam thuoc, am thuc, nam thu
van anh » van thanh, van minh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
mang xa » lang xa, mang may, mang cua
cua te » cua tu
tuan » quan, tran, luan

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((mang xa) or (dang xay)) hoi. hieu van nam thuc ((van anh) OR (tuan anh)) dieu cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((mang xa) OR (dang xay)) hoi. hieu van nam thuc ((van anh) OR (tuan anh)) dieu cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((mang xa) or (dang xay)) hoi. hieu van nam thuc ((van anh) OR (tuan anh)) dieu cua te*".