Perhaps you should try some spelling variations:
nhung huong » nhung phuong, nhung tuong, nhung cong
chinh doanh » kinh doanh
hieu sang » chieu sang, hieu quang, nhieu tang
hieu lang » chieu sang, hieu quang, nhieu tang
doanh va » doan va, doanh tai, doanh cua
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu sang) OR (hieu lang)) - chinh doanh va nhung huong dan ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sang) OR (hieu lang)) - chinh doanh va nhung huong dan ((toan cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sang) OR (hieu lang)) - chinh doanh va nhung huong dan ((toan cau) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) OR (hieu lang)) - chinh doanh va nhung huong dan ((toan cau) or (toan tap))*.