Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
cap hoang » cam hoang, cau hoang, van hoang
cap tong » cap nong, gap trong, lap trong
cong dan » cong san, cong tan, huong dan
cong tac » cong ty
toan cau » 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 ((cap tong) or (cap hoang)) ((cong dan) or (cong tac)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh trung ((cap tong) OR (cap hoang)) ((cong dan) OR (cong tac)) toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh trung ((cap tong) or (cap hoang)) ((cong dan) or (cong tac)) toan cau*.