Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
nong thong » nong thon, dong thong, cong thong
hang nong » thang long, han tong
trung va » truong va, trang va, trung ha
ngan can » ngan han, ngan van, ngan lan
va hang » van hang, va nang, va lang
nga cau » ngu cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sach) or (chieu sang)) - thanh trung va hang nong thong ((nga cau) OR (ngan can))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chieu sang)) - thanh trung va hang nong thong ((nga cau) OR (ngan can))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (chieu sang)) - thanh trung va hang nong thong ((nga cau) OR (ngan can))*".