Perhaps you should try some spelling variations:
ban danh » ban doanh, ban hanh, ban dan
thuc ban » thuoc ban, thuc dan, thu ban
so sach » so sanh, bo sach, co sach
ban can » ban dan, ban hang, ban hanh
danh vi » hanh vi, dinh vi, danh di
van can » van canh, van ban, van cau
nang ma » tang ma, sang ma, nang cao
vi cua » vai cua, di cua
cua te » cua tu

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