Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh han
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
cong vang » cong lang, cong quang, cong ngang
vang toan » van toan, dang toan, quang toan
hai hieu » hai chieu, hoi hieu, phan hieu
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hai hieu lang - hanh ((trinh quan) or (trinh luat)) nhung cong vang toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hai hieu lang - hanh ((trinh quan) OR (trinh luat)) nhung cong vang toan ban*.