Perhaps you should try some spelling variations:
trong thuong » thong thuong, trong tuong, cong thuong
chieu xanh » chieu sach, chieu sang, hieu manh
chieu tinh » trieu tinh, lieu tinh, chau tinh
thuong dan » huong dan, thuong han, thuong dam
trung cua » truong cua, trung tuan, trung cap
tang cua » mang cua, hang cua, tang luan
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: hoc ((chieu xanh) or (chieu tinh)) - hanh ((tang cua) or (trung cua)) trong thuong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chieu tinh)) - hanh ((tang cua) OR (trung cua)) trong thuong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (chieu tinh)) - hanh ((tang cua) or (trung cua)) trong thuong dan toan cau*.