Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thieu sang » chieu sang, thieu quang, hieu lang
trong dang » truong dang, trong dong, trong dung
quang qua » quang cua, quang tuan, quang xuan
trong dan » trong san, trong tan, trong ban
qua dung » quang dung, su dung, qua song
tran ban » tranh ban, tran van, toan ban

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) or (thieu khang)) - tinh quang qua dung ((trong dang) OR (trong dan)) tran ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((thieu sang) OR (thieu khang)) - tinh quang qua dung ((trong dang) OR (trong dan)) tran ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu sang) or (thieu khang)) - tinh quang qua dung ((trong dang) OR (trong dan)) tran ban".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sang) or (thieu khang)) - tinh quang qua dung ((trong dang) OR (trong dan)) tran ban*.