Perhaps you should try some spelling variations:
trong thuat » trong hoat, trong thu, trong phat
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
hanh trong » hanh trang, anh trong, hinh trong
danh thang » danh thanh, dinh thang, nhanh thang
song song » song hong, song dong, xuong song
danh nhan » doanh nhan, thanh nhan, benh nhan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) OR (chieu sach)) - hanh trong thuat song song ((danh thang) or (danh nhan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chieu sach)) - hanh trong thuat song song ((danh thang) OR (danh nhan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (chieu sach)) - hanh trong thuat song song ((danh thang) or (danh nhan)) tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (chieu sach)) - hanh trong thuat song song ((danh thang) or (danh nhan)) tap*.