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