Perhaps you should try some spelling variations:
trinh nhung » trinh phuong, trinh dung
trong trinh » trong tinh, trang trinh, trong thinh
chieu sach » chinh sach, chieu sang, chieu xanh
hinh trong » chinh trong, dinh trong, sinh trong
nhung cong » dung cong, thong cong, hang cong
tap toan » tap doan, bai toan
tap quan » tac quan, hai quan

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

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