Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
theo chieu » theo tieu, ho chieu, theo chu
hanh hang » thanh hang, hang hang, hanh han
cua nhung » va nhung
tap quang » tap quan, tac quang, tao quang
tai quang » thai quang, mai quang, cai quang
hang cua » mang cua, hang ca, huong cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (hoc hien)) tinh - hanh hang cua nhung cong ((tap quang) OR (tai quang)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (hoc hien)) tinh - hanh hang cua nhung cong ((tap quang) OR (tai quang)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (hoc hien)) tinh - hanh hang cua nhung cong ((tap quang) OR (tai quang)) cao".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (hoc hien)) tinh - hanh hang cua nhung cong ((tap quang) OR (tai quang)) cao*.