Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thieu sang » chieu sang, thieu quang, hieu lang
tang luan » dung luan
bang cong » dang cong, bang song, dung cong
hang cong » dang cong, hang nong, thanh cong
anh tang » anh bang, anh dang, anh nang
tac toan » tap toan, tam toan, hach toan
toan tap » toan 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) OR (thieu khang)) - anh tang luan ((bang cong) or (hang cong)) tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu khang)) - anh tang luan ((bang cong) OR (hang cong)) tac toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (thieu khang)) - anh tang luan ((bang cong) or (hang cong)) tac toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) OR (thieu khang)) - anh tang luan ((bang cong) or (hang cong)) tac toan tap*.