Perhaps you should try some spelling variations:
trong thuan » trong thuat, trong tuan, trong thuong
trong chuan » thong chuan, trong chan, trong chuong
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
hang cong » dang cong, hang nong, bang cong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, 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: doi ((chieu xanh) or (chieu sang)) - hanh ((trong chuan) OR (trong thuan)) hang cong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu xanh) OR (chieu sang)) - hanh ((trong chuan) OR (trong thuan)) hang cong dan than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu xanh) or (chieu sang)) - hanh ((trong chuan) OR (trong thuan)) hang cong dan than cao".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu xanh) or (chieu sang)) - hanh ((trong chuan) OR (trong thuan)) hang cong dan than cao*.