Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thieu sang » chieu sang, thieu khang, hieu lang
hang cong » dang cong, hang nong, bang cong
tang qua » tang quan, tang cua, tang quang
tang quy » tan quy, nang quy, tang quan
cong ban » cong bang, cong san, cong tan
ban than » ban thanh, van thanh, ban hang
than cao » toan cao, thai cao, than cap

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)) - hanh ((tang qua) OR (tang quy)) hang cong ban than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu quang)) - hanh ((tang qua) OR (tang quy)) hang cong ban than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (thieu quang)) - hanh ((tang qua) OR (tang quy)) hang cong ban than cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (thieu quang)) - hanh ((tang qua) OR (tang quy)) hang cong ban than cao*.