Perhaps you should try some spelling variations:
thiet danh » thien danh, thien dang, tiep danh
truong cua » truong ca, truong quan, truong cao
thien anh » thien danh, tien anh, thien thanh
trung cua » trung tuan, trung cap, dung cua
cong nong » cong dong, cong cong, cong trong
nong san » cong san, dong san, nong dan
san toan » van toan, dan toan, manh 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: hoc ((thiet danh) OR (thien anh)) - hanh ((trung cua) or (truong cua)) cong nong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet danh) OR (thien anh)) - hanh ((trung cua) OR (truong cua)) cong nong san toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet danh) OR (thien anh)) - hanh ((trung cua) or (truong cua)) cong nong san toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet danh) OR (thien anh)) - hanh ((trung cua) or (truong cua)) cong nong san toan cao*.