Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
nhanh lang » nhanh quang, nhanh thang, nhan dang
hoc thieu » toc thieu, hoc hien
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
lang va » lang van, hang va, lang ha

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 - nhanh lang va nhung ((cong dan) OR (cong tan)) ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - nhanh lang va nhung ((cong dan) OR (cong tan)) ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - nhanh lang va nhung ((cong dan) OR (cong tan)) ((toan cau) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - nhanh lang va nhung ((cong dan) OR (cong tan)) ((toan cau) or (toan cao))*.