Perhaps you should try some spelling variations:
ban doan » ban doanh, ban dan, ban soan
cuu ban » cuu van, cua ban, cuu san
sach ky » sac ky, sach ty, sach kem
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ve cac » va cac, vien cac
va cua » va chua, via cua, ca cua
ve cam » ve cham, va cam, ve cai

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) OR (sach y)) lang xa 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) OR (sach y)) lang xa hoi. hieu ((ve cam) OR (ve cac)) cuu ban doan va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach y)) lang xa hoi. hieu ((ve cam) or (ve cac)) cuu ban doan va cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach y)) lang xa hoi. hieu ((ve cam) or (ve cac)) cuu ban doan va cua tre*.