Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thanh thang » thanh thanh, thanh hang, thanh toan
nhanh thang » nhanh thanh, nhanh quang, hanh trang
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
cong san » cong tac
toan cao » toan tap
toan ban » van ban

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