Perhaps you should try some spelling variations:
nhieu tang » chieu sang, hieu lang, nhiet nang
trinh quan » tinh quang, trinh luat, trinh han
doi nhieu » doi chieu, doi nhu, doi hien
trinh cua » tinh cua, trinh luat, trinh luan
dung cong » dung trong
van toan » van tan, van thanh, manh toan
van tuan » van quan, van ban, anh tuan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi nhieu tang - hanh ((trinh cua) OR (trinh quan)) dung cong ((van toan) OR (van tuan)) cau~.
• Adding a wildcard symbol may retrieve word variants: doi nhieu tang - hanh ((trinh cua) or (trinh quan)) dung cong ((van toan) or (van tuan)) cau*.