Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
nong dan » cong dan, nguong dan, huong dan
nong san » dong san, trong san, nang sang
cong san » cong tac
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 thieu sang - thanh trung cua nhung ((((nong dan) OR (nong san))) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh trung cua nhung ((((nong dan) OR (nong san))) OR (cong san)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - thanh trung cua nhung ((((nong dan) OR (nong san))) or (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh trung cua nhung ((((nong dan) OR (nong san))) or (cong san)) toan cao*.