Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thanh trung » thanh tung
hoc thien » hoc hien, hoc thieu, hoc thiet
trung cua » truong cua, trung tuan, trung cap
cong nong » cong dong, cong cong, cong trong
nong dan » cong dan, nong san, nguong dan
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 thien thanh - thanh trung cua cong nong dan ((toan cao) or (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien thanh - thanh trung cua cong nong dan ((toan cao) OR (van ban))*.