Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu quang » thieu quang, hieu quan, hieu qua
hieu lang » chieu sang, nhieu tang, hieu van
trong ban » trong san, trong tan, trong quan
trung co » trung bo, trong co, truong cao
co dung » co duong, cao dung, co dong
ban pha » ban phap, ban nha, ban ha
pha cau » phan cau, phap cau, pha cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu quang) or (hieu lang)) - thanh trung co dung trong ban pha cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu quang) OR (hieu lang)) - thanh trung co dung trong ban pha cau.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu quang) or (hieu lang)) - thanh trung co dung trong ban pha cau*.