Perhaps you should try some spelling variations:
ban doan » ban doanh, ban dan, ban soan
te sach » toc sach
sach ky » sac ky, sach y, sach ty
doan vi » doan va, don vi, doan thi
cuu ban » cuu van, cua ban, cuu san
ve cham » va cham, ve chat, vu cham
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
ve cam » va cam, ve cai, ve cau
vi cua » vai cua, di 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 lang xa hoi. hieu ((((ve cam) OR (ve cham))) or (ve cac)) cuu ban doan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. hieu ((((ve cam) OR (ve cham))) OR (ve cac)) cuu ban doan vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. hieu ((((ve cam) OR (ve cham))) or (ve cac)) cuu ban doan vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. hieu ((((ve cam) OR (ve cham))) or (ve cac)) cuu ban doan vi cua tre*.