Perhaps you should try some spelling variations:
ban danh » ban doanh, ban hanh, ban dan
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
thu ban » thu hang
bac thu » bac thua, bach thu, cac thu
van bac » van ban, van bao, van hac
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y ((nang xa) or (nang ma)) hoi. hieu van bac thu ban danh ((vi cua) OR (di cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang xa) OR (nang ma)) hoi. hieu van bac thu ban danh ((vi cua) OR (di cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y ((nang xa) or (nang ma)) hoi. hieu van bac thu ban danh ((vi cua) OR (di cua)) te".
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang xa) or (nang ma)) hoi. hieu van bac thu ban danh ((vi cua) OR (di cua)) te*.