Perhaps you should try some spelling variations:
thong duong » tuong duong, thong dung, thong huong
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu xanh » hieu manh, hieu nganh, dieu hanh
duong dan » duong dang, huong dan, duong van
tranh va » tranh van, trang va, trinh va
va thong » va thuong, va phuong, he thong
phan cac » nhan cach, phan dau, phan lap

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: doc ((hieu xanh) OR (chieu xanh)) - canh tranh va thong duong dan ((phan tu) OR (phan cac))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (chieu xanh)) - canh tranh va thong duong dan ((phan tu) or (phan cac))~".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) OR (chieu xanh)) - canh tranh va thong duong dan ((phan tu) or (phan cac))*.