Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, hieu quan
trien quang » tran quang, tuyen quang, dien quang
tranh cua » manh cua
doanh cua » doanh luan
dung cong » dung trong
cong hach » cong sach, cong thanh, cong khanh
hach toan » thanh toan, manh toan
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 quang) OR (trien quang)) - hanh ((tranh cua) or (doanh cua)) dung cong hach toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu quang) OR (trien quang)) - hanh ((tranh cua) OR (doanh cua)) dung cong hach toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu quang) OR (trien quang)) - hanh ((tranh cua) or (doanh cua)) dung cong hach toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu quang) OR (trien quang)) - hanh ((tranh cua) or (doanh cua)) dung cong hach toan cao*.