Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
tinh nang » trinh nang, tin nang, tich nang
doc hieu » toc thieu, hoc thieu, hoc hien
cac toan » cac khoan, hach toan, cac thanh
toan ban » van ban
nang tu » nang du, nang luc
tu dung » tuc dung, tu duong, su dung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu quang - tinh nang tu dung trong cac toan ban~.
• Adding a wildcard symbol may retrieve word variants: doc hieu quang - tinh nang tu dung trong cac toan ban*.