Perhaps you should try some spelling variations:
trien quang » tran quang, tuyen quang, dien quang
thong cong » trong cong, tong cong, thong thong
hoc trien » hoc tren, hoc tien, hoc truyen
manh cua » doanh cua, ban cua
tang cua » mang cua, hang cua, tang luan
dan than » ban than, van than, dan toan
dan chan » dan gian, dan ca, van chat

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: hoc trien quang - hanh ((manh cua) OR (tang cua)) thong cong ((dan than) OR (dan chan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc trien quang - hanh ((manh cua) or (tang cua)) thong cong ((dan than) OR (dan chan)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc trien quang - hanh ((manh cua) or (tang cua)) thong cong ((dan than) OR (dan chan)) cau*.