Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
dang cong » dung cong
phan cau » phan dau, phan tu, phan lap
phan cac » nhan cach, phan dau, phan lap

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