Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thanh trung » thanh tung
thieu sang » chieu sang, thieu quang, hieu lang
nhung cong » dung cong, thong cong, hang cong
trung hay » trung ha, trung hai, trung gay
hay nhung » tay nhung, tham nhung, thai nhung
manh toan » thanh toan, anh tuan, tinh toan
van thanh » ban thanh, van tuan

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