Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
canh sinh » canh tinh, canh binh, tinh sinh
cong dang » cong dong, cong dung, cong danh
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 dau » phan tu, hang 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 dang)) phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sang - canh sinh van hung ((cong dan) OR (cong dang)) phan dau*.