Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
luong quan » duong qua
hieu manh » chieu xanh, hieu nganh, dieu hanh
lang nong » hang nong, lang dong, lang song
nong ban » nong dan, nong san, dong ban
ban toan » bai toan, ban than, van toan
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 ((hieu manh) or (chieu sach)) - thanh ((luong quan) OR (thong quan)) lang nong ban toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu manh) OR (chieu sach)) - thanh ((luong quan) OR (thong quan)) lang nong ban toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu manh) or (chieu sach)) - thanh ((luong quan) OR (thong quan)) lang nong ban toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (chieu sach)) - thanh ((luong quan) OR (thong quan)) lang nong ban toan cao*.