Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sach » chinh sach, chiet tach, chieu sang
cao thanh » dao thanh, cho thanh, cac thanh
tung cao » nung cao, truong cao, trung cap
dan than » dan chan, ban than, van than
van toan » van tuan, van tan, van thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu tinh) or (chieu sach)) - thanh tung cao thanh cong ((dan than) or (van toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu tinh) OR (chieu sach)) - thanh tung cao thanh cong ((dan than) OR (van toan)) cao.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu tinh) or (chieu sach)) - thanh tung cao thanh cong ((dan than) or (van toan)) cao*.