Perhaps you should try some spelling variations:
hang doanh » hanh doanh, nhung doanh, van doanh
cua truong » cua trung, xuan truong, cac truong
hien sach » dien sach, kien sach, thien hach
hua khong » hoa khong, cua khong, hoac khong
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien sach - hang doanh ((hua khong) or (cua truong)) cong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - hang doanh ((hua khong) OR (cua truong)) cong tan van ban.
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - hang doanh ((hua khong) or (cua truong)) cong tan van ban*.