Perhaps you should try some spelling variations:
duong cong » dung cong, luong cong, duong trong
chau tinh » cuu tinh, ha tinh, cua tinh
lieu tinh » trieu tinh, diep tinh, bien tinh
tranh qua » tranh cua, thanh qua, trinh qua
qua duong » quan duong, qua dung, qua dong
tap toan » tap doan, bai toan
tap quan » tac quan, hai quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chau tinh) or (lieu tinh)) - canh tranh qua duong cong ((tap toan) or (tap quan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chau tinh) OR (lieu tinh)) - canh tranh qua duong cong ((tap toan) OR (tap quan)) cao.
• Adding a wildcard symbol may retrieve word variants: doi ((chau tinh) or (lieu tinh)) - canh tranh qua duong cong ((tap toan) or (tap quan)) cao*.