Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh nhan
doanh ban » doanh bat, doanh nhan, doanh luan
co sach » cuon sach, hoc sach
bo sach » hoc sach
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duc van » duc va, duc tan, duc manh
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: ((co sach) OR (bo sach)) ty nang x ho. hieu ve pham duc van ((doanh van) or (doanh ban)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co sach) OR (bo sach)) ty nang x ho. hieu ve pham duc van ((doanh van) OR (doanh ban)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((co sach) OR (bo sach)) ty nang x ho. hieu ve pham duc van ((doanh van) or (doanh ban)) cua te".
• Adding a wildcard symbol may retrieve word variants: ((co sach) OR (bo sach)) ty nang x ho. hieu ve pham duc van ((doanh van) or (doanh ban)) cua te*.