Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
thanh co » thanh do, thanh ca, thanh ho
vien cac » vien bach, vien dai, vien da
duc ban » duc tan, duc van, dua ban
ve cac » va cac
cua te » cua tu
cua cu » cua chu, cua cau, cua su
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach thieu nang x hoi. hieu ((ve cac) OR (vien cac)) duc ban thanh co ((cua te) OR (cua cu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach thieu nang x hoi. hieu ((ve cac) OR (vien cac)) duc ban thanh co ((cua te) or (cua cu))~".
• Adding a wildcard symbol may retrieve word variants: thu sach thieu nang x hoi. hieu ((ve cac) OR (vien cac)) duc ban thanh co ((cua te) or (cua cu))*.