Perhaps you should try some spelling variations:
trinh hang » trinh han, tranh hang, trinh hanh
hoa chinh » hoan chinh, hoa hinh, hoa thinh
hoc chinh » hoan chinh, hoc sinh, hoc kinh
tranh cua » doanh cua, manh cua
hang cong » dang cong, bang cong, thanh cong
hang nong » thang long, han tong
hang cau » hang dau, hang ca, nhung cau

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

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