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
cong vang » cong lang, cong quang, cong ngang
cong van » cong san, song van, cong tan
tuan ban » tuan bang, toan ban, luan ban

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 van) OR (cong vang)) tuan 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 van) OR (cong vang)) tuan 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 van) OR (cong vang)) tuan ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((truong cao) or (trung thanh)) hang ((cong van) OR (cong vang)) tuan ban*.