Perhaps you should try some spelling variations:
thanh thong » thanh thuong, thanh hong, thanh thang
thieu sang » chieu sang, thieu khang, thieu quang
phap thong » phap phong, phap chong, pho thong
hoc thieu » toc thieu, hoc hien
cap thong » cap tong, chap thuong, chap phong
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: hoc thieu sang - thanh thong ((cap thong) OR (phap thong)) cong san ((toan cao) or (ban cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh thong ((cap thong) OR (phap thong)) cong san ((toan cao) OR (ban cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - thanh thong ((cap thong) OR (phap thong)) cong san ((toan cao) or (ban cau))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh thong ((cap thong) OR (phap thong)) cong san ((toan cao) or (ban cau))*.