| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| yu et al. 2008 | 1.82 | 0.8 | 736 | 2 | 14 |
| yu | 1.43 | 0.6 | 6995 | 7 | 2 |
| et | 1.31 | 0.6 | 8975 | 23 | 2 |
| al. | 0.05 | 0.4 | 4255 | 92 | 3 |
| 2008 | 0.14 | 0.6 | 2680 | 75 | 4 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| yu et al. 2008 | 1.59 | 0.7 | 3416 | 14 |
| yu et al. 2006 | 1.55 | 0.2 | 2313 | 52 |
| yu et al. 2007 | 0.58 | 1 | 3665 | 5 |
| yu et al. 2009 | 0.62 | 0.2 | 770 | 89 |
| yu et al. 2005 | 0.47 | 0.8 | 6617 | 91 |
| yu et al. 2004 | 1.19 | 0.6 | 9070 | 55 |
| yu et al. 2003 | 0.16 | 0.3 | 8302 | 89 |
| yu et al. 2018 | 0.49 | 0.8 | 7864 | 74 |
| yu et al. 2010 | 0.39 | 0.9 | 2523 | 32 |
| yu et al. 2016 | 1.72 | 0.7 | 9332 | 75 |
