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 dong » nhung don, nhung dung, nhung bong
nhung cong » dung cong, thong cong, hang cong
trinh cua » tinh cua, trinh luat, trinh quan
toan ban » van ban

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