Perhaps you should try some spelling variations:
dong thanh » truong thanh
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
dung dong » dung cong, vung dong, dung trong
anh tang » anh bang, anh dang, anh nang
tang tin » trang tin, nang tin, tang tan
toan tai » toan tap, doanh tai, toan ban
tuan tai » quan tai, tan tai, tuan tuoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sang - anh tang tin dung dong thanh ((toan tai) or (tuan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - anh tang tin dung dong thanh ((toan tai) OR (tuan tai)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - anh tang tin dung dong thanh ((toan tai) or (tuan tai))*.