Perhaps you should try some spelling variations:
truong dong » truong dang, tuong dong, thuong dong
thieu sang » chieu sang, thieu khang, thieu quang
thanh tung » thanh cong
trong dong » trong cong, trong nong, trong dang
hoc thieu » toc thieu, hoc hien
bang than » bang thanh, ban than, sang than
than cap » khan cap, thanh lap, thanh cac
tung va » trung va, tuong va, dung va

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 tung va ((truong dong) or (trong dong)) bang than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh tung va ((truong dong) OR (trong dong)) bang than cap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh tung va ((truong dong) or (trong dong)) bang than cap*.