Perhaps you should try some spelling variations:
dang xay » dang van, van xay
ban doan » ban doanh, ban dan, ban soan
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
cuu ban » cuu van, cua ban, cuu san
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky dang xay hoi. hieu ((ve cam) or (ve cac)) cuu ban doan va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang xay hoi. hieu ((ve cam) OR (ve cac)) cuu ban doan va cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky dang xay hoi. hieu ((ve cam) or (ve cac)) cuu ban doan va cua tre*.