Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
trung thanh » truong thanh
thieu sang » chieu sang, thieu khang, hieu lang
manh trung » manh tung, thanh trung, manh hung
chung cong » nhung cong, chong cong, phung cong
dung cong » dung trong
danh toan » manh toan, anh toan, dan toan
toan cao » toan ban, toan tap

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