Perhaps you should try some spelling variations:
nhung huong » nhung phuong, nhung tuong, nhung cong
hieu quang » thieu quang, hieu quan, hieu qua
huong tinh » khuong tinh, thuong tinh, duong tinh
hieu lang » chieu sang, nhieu tang, hieu van
hanh minh » thanh minh, hinh minh, hanh tinh
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
minh va » tinh va, sinh va, sinh vat

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

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