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
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
cong ban » cong bang, cong tan, cong dan
cong san » cong tac
tvan cau » toan cau, toan cao, va cau
van cau » van dau, van hau, van chat

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 cua nhung ((cong ban) or (cong san)) ((tvan cau) or (van cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh trung cua nhung ((cong ban) OR (cong san)) ((tvan cau) OR (van cau)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh trung cua nhung ((cong ban) or (cong san)) ((tvan cau) or (van cau))*.