Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thieu sang » chieu sang, thieu khang, hieu lang
dong thanh » truong thanh
dung dong » dung cong, vung dong, dung trong
anh tang » anh bang, anh dang, anh nang
tang van » dang van, hoang van, trong van
van dung » van dong, xay dung, tin dung
tuan tap » toan tap, tuyen tap, toan tai
tuan tai » toan tai, quan tai, tan tai

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) OR (thieu quang)) - anh tang van dung dong thanh ((tuan tap) or (tuan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu quang)) - anh tang van dung dong thanh ((tuan tap) OR (tuan tai)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (thieu quang)) - anh tang van dung dong thanh ((tuan tap) or (tuan tai))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) OR (thieu quang)) - anh tang van dung dong thanh ((tuan tap) or (tuan tai))*.