Perhaps you should try some spelling variations:
nhieu tang » chieu sang, nhiet nang
trinh luan » trinh luat, trinh han, trinh toan
trinh quan » tinh quang, trinh luat, trinh han
hieu lang » chieu sang, hieu quang, hieu van
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi ((hieu lang) OR (nhieu tang)) - hanh ((trinh luan) or (trinh quan)) dung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((hieu lang) OR (nhieu tang)) - hanh ((trinh luan) OR (trinh quan)) dung cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi ((hieu lang) OR (nhieu tang)) - hanh ((trinh luan) or (trinh quan)) dung cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu lang) OR (nhieu tang)) - hanh ((trinh luan) or (trinh quan)) dung cong dan toan cau*.