Perhaps you should try some spelling variations:
truong phuong » truong chung, truong trung, dung phuong
doanh luan » doanh nhan
phuong dan » phuong danh, phuong doan, huong dan
hieu sach » chieu sach, dien sach, hieu cac
hieu cach » hieu cac, chieu sach, hieu ca
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu sach) or (hieu cach)) - hanh ((doanh cua) OR (doanh luan)) truong phuong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sach) OR (hieu cach)) - hanh ((doanh cua) OR (doanh luan)) truong phuong dan chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sach) or (hieu cach)) - hanh ((doanh cua) OR (doanh luan)) truong phuong dan chan cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) or (hieu cach)) - hanh ((doanh cua) OR (doanh luan)) truong phuong dan chan cau*.