Perhaps you should try some spelling variations:
lieu tinh » trieu tinh, diep tinh, bien tinh
nang hang » nang sang, hang hang, cang thang
manh toan » thanh toan, anh tuan, tinh toan
doi lieu » duoc lieu, doi chieu, du lieu
dan toan » van toan, dan than, xuan toan
va dong » van dong, xa dong, lao dong
ha dong » hoat dong, van dong

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 - nang hang ((va dong) OR (ha dong)) duong ((dan toan) OR (manh toan)) tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi lieu tinh - nang hang ((va dong) or (ha dong)) duong ((dan toan) OR (manh toan)) tap~".
• Adding a wildcard symbol may retrieve word variants: doi lieu tinh - nang hang ((va dong) or (ha dong)) duong ((dan toan) OR (manh toan)) tap*.