Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh thanh, dong doanh
hanh trang » thanh trung, canh tranh, hanh trinh
doanh hoan » doanh khoa, doanh nhan, doanh luan
tieu sach » chieu sach, dien sach, te sach
hanh mang » nhanh mang, nhanh lang, thanh hang
luan cong » luat cong, luong cong, luan chung

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - ((hanh mang) or (hanh trang)) luan cong dong ((doanh doanh) OR (doanh hoan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - ((hanh mang) OR (hanh trang)) luan cong dong ((doanh doanh) OR (doanh hoan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - ((hanh mang) or (hanh trang)) luan cong dong ((doanh doanh) OR (doanh hoan)) cau".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - ((hanh mang) or (hanh trang)) luan cong dong ((doanh doanh) OR (doanh hoan)) cau*.