Perhaps you should try some spelling variations:
thanh trung » thanh tung
phuong manh » phuong anh, phung manh, phuong hanh
phuong danh » phuong anh, phuong dinh, phuong hanh
chieu sang » chieu sach, chieu xanh, hieu lang
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung cua » truong cua, trung tuan, trung cap
cua dung » cua dang, cua dong, qua dung
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: theo ((hieu manh) or (chieu sang)) - thanh trung cua dung ((phuong manh) OR (phuong danh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu manh) OR (chieu sang)) - thanh trung cua dung ((phuong manh) OR (phuong danh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu manh) or (chieu sang)) - thanh trung cua dung ((phuong manh) OR (phuong danh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu manh) or (chieu sang)) - thanh trung cua dung ((phuong manh) OR (phuong danh)) toan cao*.