Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
hieu quang » thieu quang, hieu quan, hieu qua
dang trong » dung trong, dong trong, lang trong
trung nam » trung tam, trong nam, trung cap
trong tan » trong quan, trong cac, trong ca
nam dang » nam dan, nam danh, nam dong
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sang) or (hieu quang)) - thanh trung nam dang trong tan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu quang)) - thanh trung nam dang trong tan than cau.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) or (hieu quang)) - thanh trung nam dang trong tan than cau*.