Perhaps you should try some spelling variations:
ban danh » ban doanh, ban hanh, ban dan
tu sach » thu sach, su sach, te sach
cuu ban » cuu van, cua ban, cuu san
cac cuu » cap cuu, cac cau, cac chu
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
van hoe » van hoa, van hoc, van hieu
van hoi » van hoa, van hoc, van loi
ky lang » ky nang, ky dang, ky tang
ve cac » va cac, vien cac
di cua » doi cua, de cua, do cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky lang ((van hoi) or (van hoe)). hieu ve cac cuu ban danh ((di cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang ((van hoi) OR (van hoe)). hieu ve cac cuu ban danh ((di cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang ((van hoi) or (van hoe)). hieu ve cac cuu ban danh ((di cua) or (dai cua)) tre*.