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