Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
thieu sang » chieu sang, thieu khang, thieu quang
hanh sinh » hanh tinh, hanh dinh, hinh sinh
phan chat » phan phat, phap chat, nhan chat
nam nhat » pham nhat, am nhac, cam nhan
sinh va » sinh vat, tinh va, dinh van

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 - hanh sinh va thuong cong ((phan chat) or (nam nhat)) ran~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sang - hanh sinh va thuong cong ((phan chat) OR (nam nhat)) ran*.