Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu xanh » chieu sach, chieu sang, chieu tinh
tam thuong » tai thuong, tam huong, pham thuong
anh xquang » anh quan, anh xuan
nam thong » nam trong, nam thang, nam phong
anh quang » anh quan, nhanh quang, tinh quang
ho chieu » theo chieu, hoc thieu, doi chieu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu xanh - thanh trung ((tam thuong) OR (nam thong)) cong ((anh quang) OR (anh xquang)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu xanh - thanh trung ((tam thuong) or (nam thong)) cong ((anh quang) OR (anh xquang)) cao~".
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - thanh trung ((tam thuong) or (nam thong)) cong ((anh quang) OR (anh xquang)) cao*.