Perhaps you should try some spelling variations:
communication foundation » communication education, communication communication, communication information
foundation methods » foundations methods, oxidation methods, validation methods
methods session » methods section
du lifei » du lei, lu yifei
du line » dual line, du livre
de ling » de liang, de lin, de lange
d line » 2d line, 3d line, d ling

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication foundation methods session ((((du line) or (du lifei))) or (((d line) or (de ling))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication foundation methods session ((((du line) OR (du lifei))) OR (((d line) OR (de ling)))).
• Adding a wildcard symbol may retrieve word variants: communication foundation methods session ((((du line) or (du lifei))) or (((d line) or (de ling))))*.