Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
hoc hieu » hoc thieu, hoc hien, doc hieu
tung cua » trung cua, tuong cua, dung cua
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - manh ((tung cua) or (trung tam)) nhung cong dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - manh ((tung cua) OR (trung tam)) nhung cong dan toan tap*.