Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhieu tang » chieu sang, hieu lang, nhiet nang
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
hanh tinh » nhanh tinh, thanh tinh, canh tinh
cua nhung » va nhung
trinh san » trinh han, trinh quan, trinh toan
san dau » van dau, san diu, ban dau

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) or (nhieu tang)) - ((hanh tinh) OR (hanh trinh)) cua nhung cong trinh san dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quang) OR (nhieu tang)) - ((hanh tinh) OR (hanh trinh)) cua nhung cong trinh san dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu quang) or (nhieu tang)) - ((hanh tinh) OR (hanh trinh)) cua nhung cong trinh san dau".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quang) or (nhieu tang)) - ((hanh tinh) OR (hanh trinh)) cua nhung cong trinh san dau*.