Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thanh hoang » thanh cong, thanh hoa, thanh toan
thieu sang » chieu sang, thieu quang, hieu lang
trinh toan » tinh toan, thanh toan, trinh han
anh quang » anh xquang, anh quan, nhanh quang
quan dung » quang dung, quan duong, qua dung
dung cong » dung trong
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 quang) or (thanh hoang)) quan dung cong trinh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu khang)) - ((anh quang) OR (thanh hoang)) quan dung cong trinh toan tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (thieu khang)) - ((anh quang) or (thanh hoang)) quan dung cong trinh toan tap*".