Perhaps you should try some spelling variations:
doanh hoan » doanh doanh, doanh nhan, doanh luan
doanh khoa » toan khoa
trong san » trong cac, cong san, dong san
theo chu » theo chieu, cho chu, chao chu
chu sach » cau sach, thu sach, chieu sach
phan van » pham van, thanh van, luan van
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chu sach - ((doanh hoan) or (doanh khoa)) su dung trong san ((phan van) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu sach - ((doanh hoan) OR (doanh khoa)) su dung trong san ((phan van) OR (phan dau)).
• Adding a wildcard symbol may retrieve word variants: theo chu sach - ((doanh hoan) or (doanh khoa)) su dung trong san ((phan van) or (phan dau))*.