Perhaps you should try some spelling variations:
trung thanh » truong thanh
bien quang » dien quang, trien quang, lien quan
canh trinh » canh tranh, hanh trinh, anh trinh
canh tinh » hanh tinh, manh tinh, canh tranh
ung trung » dung trung, vung trung, ung trong
thanh hoa » thanh pho
hoc bien » hoc hien, hoc vien, hoa bien
hoa dau » hoa dan, hoa dai, hoa dam

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc bien quang - ((canh trinh) or (canh tinh)) va ung trung thanh hoa dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc bien quang - ((canh trinh) OR (canh tinh)) va ung trung thanh hoa dau*.