Perhaps you should try some spelling variations:
cong khanh » cong thanh, cong khan, cong nhan
thieu sang » chieu sang, thieu khang, thieu quang
canh sinh » canh tinh, canh binh, tinh sinh
sinh van » sinh vat, dinh van, sinh va
van hung » van dung, manh hung, van duong
cong dan » cong san, cong tan, huong dan
phan lap » phan dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu sang - canh sinh van hung ((cong dan) or (cong khanh)) phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sang - canh sinh van hung ((cong dan) OR (cong khanh)) phan lap*.