Perhaps you should try some spelling variations:
phuong manh » phuong anh, phuong danh, phuong hanh
chieu xanh » chieu sach, chieu sang, chieu tinh
phung manh » hung manh, nhung manh, phung minh
hoc chieu » hoc thieu, ho chieu, hoc hien
trang dan » trang doan, trong dan, trang van
tang dan » tang van, tung dan, tang luan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu xanh - hanh ((trang dan) or (tang dan)) thuc ((phuong manh) OR (phung manh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu xanh - hanh ((trang dan) OR (tang dan)) thuc ((phuong manh) OR (phung manh)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu xanh - hanh ((trang dan) or (tang dan)) thuc ((phuong manh) OR (phung manh)) toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - hanh ((trang dan) or (tang dan)) thuc ((phuong manh) OR (phung manh)) toan tap*.