Perhaps you should try some spelling variations:
duong cong » dung cong, luong cong, duong trong
canh manh » lanh manh, canh tranh, cach mang
cua duong » cua dong, cua huong, qua duong
cong suat » nang suat, cong san, cong cua
ho chieu » theo chieu, hoc thieu, doi chieu
manh cua » doanh cua, ban cua
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang dau
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (doi chi)) xanh - canh manh cua duong cong suat ((phan cau) OR (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chi)) xanh - canh manh cua duong cong suat ((phan cau) OR (phan dau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chi)) xanh - canh manh cua duong cong suat ((phan cau) OR (phan dau))".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chi)) xanh - canh manh cua duong cong suat ((phan cau) OR (phan dau))*.