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
doanh cua » doanh luan
hach toan » thanh toan, manh toan
manh cua » ban cua
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 ((manh cua) or (doanh cua)) dung trong hach toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu quang - hanh ((manh cua) OR (doanh cua)) dung trong hach toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu quang - hanh ((manh cua) or (doanh cua)) dung trong hach toan cao*.