Perhaps you should try some spelling variations:
thien van » thi van
ban thanh » ban hanh, ban hang
thanh cac » hanh cac, thanh bac, thanh ca
dang xay » dang van, van xay
nam thuc » nam thuoc, am thuc, nam thu
thuc ban » thuoc ban, thuc dan, thu ban
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
cac cua » cach cua, cac qua, ca cua
cua tre » cua te, cuu tre, cua triet

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 ty ((nang xa) or (dang xay)) hoi. thien van nam thuc ban thanh cac cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ((nang xa) OR (dang xay)) hoi. thien van nam thuc ban thanh cac cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ty ((nang xa) or (dang xay)) hoi. thien van nam thuc ban thanh cac cua tre*.