Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
truong ca » truong cao, truong va, trong ca
hoc hieu » hoc thieu, hoc hien, doc hieu
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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: hoc hieu lang - hanh ((trung tam) or (truong ca)) nhung cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh ((trung tam) OR (truong ca)) nhung cong dan toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh ((trung tam) or (truong ca)) nhung cong dan toan ban*.