Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
theo hieu » theo chieu, theo tieu, thien hieu
ganh sang » lanh sang, doanh sang, nang sang
ganh nang » anh nang, nganh nong, van nang
cua nhung » va nhung
anh sang » lanh sang, anh bang, anh dang
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo hieu quang - ((anh sang) or (((ganh sang) OR (ganh nang)))) cua nhung cong tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu quang - ((anh sang) OR (((ganh sang) OR (ganh nang)))) cua nhung cong tac toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu quang - ((anh sang) or (((ganh sang) OR (ganh nang)))) cua nhung cong tac toan tap".
• Adding a wildcard symbol may retrieve word variants: theo hieu quang - ((anh sang) or (((ganh sang) OR (ganh nang)))) cua nhung cong tac toan tap*.