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 ha » trung hoc, trung tam, trung cap
nong san » dong san, nong dan, trong san
cong san » cong tac
than cap » khan cap, thanh lap, thanh cac
toan cao » toan ban, toan tap
ha tang » phap tang, cao tang, kho tang

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 ha tang ((nong san) or (cong san)) ((than cap) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh trung ha tang ((nong san) OR (cong san)) ((than cap) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh trung ha tang ((nong san) or (cong san)) ((than cap) or (toan cao))*.