Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhieu tang » chieu sang, hieu lang, nhiet nang
thong cong » trong cong, tong cong, thong thong
trinh quan » tinh quang, trinh luat
hanh tang » hanh trang, anh tang, hanh mang
van thong » van thuong, van phong, va thong
tang van » dang van, hoang van, trong van

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