Perhaps you should try some spelling variations:
thuong hang » thuong han, thuong hung, thuong lang
thieu sang » chieu sang, thieu khang, thieu quang
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
hang tap » hang tai, han tap, hang tmcp
tap toan » tap doan, tap quan, bai 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 - ((thanh trung) or (thanh tung)) va thuong hang tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - ((thanh trung) OR (thanh tung)) va thuong hang tap toan cao*.