Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh thang » nhanh thang, thanh thang, hanh trang
cong tinh » cong trinh, cong vinh, long tinh
toan cao » toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu
he dung » nghe dung, hoc dung, he trung
he dong » ha dong, de dong, he cong
te dung » tieu dung, tien dung, tin dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu quang - hanh thang ((((he dung) OR (he dong))) or (te dung)) cong tinh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quang - hanh thang ((((he dung) OR (he dong))) OR (te dung)) cong tinh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu quang - hanh thang ((((he dung) OR (he dong))) or (te dung)) cong tinh toan cao".
• Adding a wildcard symbol may retrieve word variants: ho hieu quang - hanh thang ((((he dung) OR (he dong))) or (te dung)) cong tinh toan cao*.