Perhaps you should try some spelling variations:
trung thanh » truong thanh
thieu sang » chieu sang, thieu khang, thieu quang
truong cao » truong dai
hoc thieu » toc thieu, hoc hien
hang cong » dang cong, hang nong, bang cong
cong san » cong tac
quan ban » quang ban, quan van, luan ban
qua ban » cua ban, qua quan

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