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
hang hang » nang hang, cang thang, hung thang
cua nhung » va nhung
hang cua » mang cua, hang ca, huong cua
toan cao » 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: theo hieu quang - hang hang cua nhung cong trinh ((((toan cao) or (toan ban))) or (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu quang - hang hang cua nhung cong trinh ((((toan cao) OR (toan ban))) OR (van ban)).
• Adding a wildcard symbol may retrieve word variants: theo hieu quang - hang hang cua nhung cong trinh ((((toan cao) or (toan ban))) or (van ban))*.