Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu xanh » chieu sach, chieu sang, chieu tinh
trung chan » trung phan, trong chan, trung can
hieu lang » chieu sang, hieu quang, nhieu tang
chan nang » chang nang, chai nang, chan dang
cong hoa » dong hoa, hang hoa
dong hoc » dong co, dong luc
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: ho ((hieu lang) or (chieu xanh)) - thanh trung chan nang ((cong hoa) OR (dong hoc)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (chieu xanh)) - thanh trung chan nang ((cong hoa) OR (dong hoc)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (chieu xanh)) - thanh trung chan nang ((cong hoa) OR (dong hoc)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (chieu xanh)) - thanh trung chan nang ((cong hoa) OR (dong hoc)) toan cao*.