Perhaps you should try some spelling variations:
dong thuong » cong thuong, dong thong, dung thuong
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sang » chieu sach, chieu xanh, hieu lang
thuong dan » huong dan, thuong han, thuong dam
trang xa » trang va, trang ha, trang tai
trong xa » trong xay, trong ca, trong xu
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu tinh) or (chieu sang)) - canh ((trang xa) OR (trong xa)) dong thuong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu tinh) OR (chieu sang)) - canh ((trang xa) OR (trong xa)) dong thuong dan toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu tinh) or (chieu sang)) - canh ((trang xa) OR (trong xa)) dong thuong dan toan cau*".