Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
trong hach » trong mach, trong cach, trong hanh
hoc thieu » toc thieu, hoc hien
tranh cua » manh cua
doanh cua » doanh luan
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 - hanh ((tranh cua) OR (doanh cua)) dung trong hach toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu quang - hanh ((tranh cua) OR (doanh cua)) dung trong hach toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu quang - hanh ((tranh cua) OR (doanh cua)) dung trong hach toan cao*.