Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
doanh cua » doanh luan
dung cong » dung trong
hoc hieu » hoc thieu, hoc hien, doc hieu
manh cua » ban cua
cong tac » cong ty
tac toan » tap toan, tam toan, hach 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 hieu quang - hanh ((((tranh cua) or (manh cua))) or (doanh cua)) dung cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu quang - hanh ((((tranh cua) OR (manh cua))) OR (doanh cua)) dung cong tac toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hieu quang - hanh ((((tranh cua) or (manh cua))) or (doanh cua)) dung cong tac toan cao*.