Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thanh thong » thanh thuong, thanh hong, thanh thang
thieu sang » chieu sang, thieu khang, hieu lang
thong cong » trong cong, tong cong, thong thong
thong cap » thong cac, trung cap, thong cua
cap thong » cap tong, chap thuong, phap thong
cong san » cong tac
toan cao » toan ban, toan tap
ban cau » bang cau, ban can, van cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((thieu sang) OR (thieu quang)) - thanh thong cap thong cong san ((toan cao) or (ban cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((thieu sang) OR (thieu quang)) - thanh thong cap thong cong san ((toan cao) OR (ban cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu sang) OR (thieu quang)) - thanh thong cap thong cong san ((toan cao) or (ban cau))".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sang) OR (thieu quang)) - thanh thong cap thong cong san ((toan cao) or (ban cau))*.