Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
van doanh » toan doanh, van dong, van thanh
hoc sach » hoc sinh, hoc cac, hoc anh
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duc van » duc va, duc tan, duc manh
van cua » vang cua, ban cua, dan cua
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach tu nang ((xa hoi) or (o hoi)). hieu ve pham duc van doanh van cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach tu nang ((xa hoi) OR (o hoi)). hieu ve pham duc van doanh van cua te*.