Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, hieu nganh, dieu hanh
hat thong » mat thong, hat trong, sat thong
cong hat » cong nhat, cong chat, cong ha
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu manh) or (((chieu sang) OR (chieu sach)))) - thanh cong hat thong cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (((chieu sang) OR (chieu sach)))) - thanh cong hat thong cong dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu manh) or (((chieu sang) OR (chieu sach)))) - thanh cong hat thong cong dan toan ban".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) or (((chieu sang) OR (chieu sach)))) - thanh cong hat thong cong dan toan ban*.