Perhaps you should try some spelling variations:
doanh tranh » doanh thanh, canh tranh, doanh doanh
quang tuan » quang thanh, quan luan, quang cua
quang tran » quang trung, quang thanh, quang tri
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
hoc mang » hoc bang, hoc hang, hoc nang
hoc tang » hoc bang, hoc tan, hoc tieng
cua hang » cua dang, cua nhung, cua cong

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc mang) OR (hoc tang)) sach - doanh tranh cua hang cong ((quang tuan) or (quang tran)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc mang) OR (hoc tang)) sach - doanh tranh cua hang cong ((quang tuan) OR (quang tran)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc mang) OR (hoc tang)) sach - doanh tranh cua hang cong ((quang tuan) or (quang tran)) cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc mang) OR (hoc tang)) sach - doanh tranh cua hang cong ((quang tuan) or (quang tran)) cau*.