Perhaps you should try some spelling variations:
phuong cuong » phuong duong, phuong luong, thuong luong
thanh trung » thanh tung
phuong dung » thong dung, cuong dung, phuong hoang
chieu xanh » chieu sach, chieu sang, chieu tinh
chiet tach » chieu sach
trung va » truong va, trang va, trung ha
bai toan » bai tap
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu xanh) or (chiet tach)) - thanh trung va ((phuong cuong) OR (phuong dung)) bai toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu xanh) OR (chiet tach)) - thanh trung va ((phuong cuong) OR (phuong dung)) bai toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu xanh) or (chiet tach)) - thanh trung va ((phuong cuong) OR (phuong dung)) bai toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (chiet tach)) - thanh trung va ((phuong cuong) OR (phuong dung)) bai toan cao*.