Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trinh » canh tranh
lieu tinh » trieu tinh, diep tinh, bien tinh
cua nhung » va nhung
doi lieu » duoc lieu, doi chieu, du lieu
dan toan » van toan, dan than, manh toan
dan chan » dan gian, dan ca, van chat

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi lieu tinh - ((hanh trinh) OR (hanh chinh)) cua nhung cong ((dan toan) OR (dan chan)) cau~.
• Adding a wildcard symbol may retrieve word variants: doi lieu tinh - ((hanh trinh) or (hanh chinh)) cua nhung cong ((dan toan) or (dan chan)) cau*.