Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
tuong cua » truong cua, huong cua, thong cua
huong ban » huong dan, huong ben, hong ban
huong lan » phuong lan, thuong lan, huong dan
phap dau » phan dau, phap day, pham dau

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 - thanh tuong cua cong ((huong ban) or (huong lan)) phap dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh tuong cua cong ((huong ban) OR (huong lan)) phap dau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh tuong cua cong ((huong ban) or (huong lan)) phap dau*.