Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hieu lang » chieu sang, hieu quang, nhieu tang
tieu dung » dieu duong, tin dung, viet dung
dung cong » dung trong
hanh han » hanh nhan, hanh phan, hanh san
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
han cua » hang cua, nhan cua, than 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 ((hieu lang) or (tieu dung)) - hanh han cua ((nhung cong) OR (dung cong)) tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (tieu dung)) - hanh han cua ((nhung cong) OR (dung cong)) tan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) or (tieu dung)) - hanh han cua ((nhung cong) OR (dung cong)) tan toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (tieu dung)) - hanh han cua ((nhung cong) OR (dung cong)) tan toan cao*.