Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
nong thong » nong thon, dong thong, cong thong
tin thanh » tinh thanh, tien thanh, thien thanh
tan thanh » tran thanh, tang thanh, toan thanh
cong cua » cong cu, dong cua, huong cua
cua nong » cua cong, cuu nong, cua dong

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sach) or (chinh sach)) - thanh cong cua nong thong ((tin thanh) OR (tan thanh)) lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (chinh sach)) - thanh cong cua nong thong ((tin thanh) OR (tan thanh)) lap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) or (chinh sach)) - thanh cong cua nong thong ((tin thanh) OR (tan thanh)) lap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (chinh sach)) - thanh cong cua nong thong ((tin thanh) OR (tan thanh)) lap*.