Perhaps you should try some spelling variations:
truong thanh » truong trung, truong thpt, truong chung
manh truong » manh trung, manh tuong, anh truong
chiet tach » chieu sach
thanh hang » thanh hoang, thanh thang, tranh hang
hieu quan » hieu qua, lieu quan, thien quan
nong dan » cong dan, nguong dan, huong dan
nong san » cong san, dong san, trong san
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: ho ((chiet tach) or (hieu quan)) - manh truong thanh hang ((nong dan) OR (nong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chiet tach) OR (hieu quan)) - manh truong thanh hang ((nong dan) OR (nong san)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chiet tach) or (hieu quan)) - manh truong thanh hang ((nong dan) OR (nong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((chiet tach) or (hieu quan)) - manh truong thanh hang ((nong dan) OR (nong san)) toan cao*.