Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
trung cap » truong cao, trung tam
bang nong » hang nong, bang song, bang cong
cap bang » cao bang, can bang, lap bang
nong dan » cong dan, nong san, nguong dan
toan cao » toan tap
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu lang) or (chieu sang)) - thanh trung cap bang nong dan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (chieu sang)) - thanh trung cap bang nong dan ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) or (chieu sang)) - thanh trung cap bang nong dan ((toan cao) or (toan ban))*.