Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
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 than » khan than, phan than, ban than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: mot chieu sach - thanh cong ((toan cong) or (tran cong)) thuong han than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: mot chieu sach - thanh cong ((toan cong) OR (tran cong)) thuong han than cau.
• Adding a wildcard symbol may retrieve word variants: mot chieu sach - thanh cong ((toan cong) or (tran cong)) thuong han than cau*.