Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thieu sang » chieu sang, thieu khang, hieu lang
hanh tang » hanh trang, anh tang, hanh mang
qua hang » mua hang, qua mang, qua nang
cua hang » cua dang, cua nhung, cua cong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
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 hang) OR (cua hang)) cong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu quang)) - hanh tang ((qua hang) OR (cua hang)) cong dan than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (thieu quang)) - hanh tang ((qua hang) OR (cua hang)) cong dan than cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (thieu quang)) - hanh tang ((qua hang) OR (cua hang)) cong dan than cao*.