Perhaps you should try some spelling variations:
cam thuong » tam thuong, ca thuong, cam truong
chieu sang » chieu sach, chieu xanh, nhieu tang
dong thanh » truong thanh
dung doanh » dung dan, dung dong
hieu lang » hieu quang, nhieu tang, hieu van
van mach » van manh, ban mach, van hach
mach cam » mach cao, manh cam, mac ca
thanh tu » hanh tu, nhanh tu, thanh tung

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sang) or (hieu lang)) - van mach cam thuong ((dong thanh) or (dung doanh)) thanh tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu lang)) - van mach cam thuong ((dong thanh) OR (dung doanh)) thanh tu.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) or (hieu lang)) - van mach cam thuong ((dong thanh) or (dung doanh)) thanh tu*.