Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
nung phong » nhung phong, rung phong, dung phong
hieu lang » chieu sang, hieu quang, nhieu tang
hanh manh » hanh mang, lanh manh, hoang manh
hoc hieu » hoc thieu, hoc hien, doc hieu
manh cua » doanh cua, ban cua
ban cao » ban can, ban co, bac cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - hanh manh cua ((nung phong) or (nhung phuong)) van ((ban cao) or (bao cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh manh cua ((nung phong) OR (nhung phuong)) van ((ban cao) OR (bao cao)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh manh cua ((nung phong) or (nhung phuong)) van ((ban cao) or (bao cao))*.