Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
thuong han » thuong mai, thuong va, thuong gap
toan cong » toan thong, doan cuong, toan trong
tran cong » tran hong, trien cong, tran hoang
han phan » than phan, hanh phan, phan phan
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) OR (chiet tach)) - thanh cong ((toan cong) or (tran cong)) thuong han phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chiet tach)) - thanh cong ((toan cong) OR (tran cong)) thuong han phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) OR (chiet tach)) - thanh cong ((toan cong) or (tran cong)) thuong han phan cau".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) OR (chiet tach)) - thanh cong ((toan cong) or (tran cong)) thuong han phan cau*.