Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
cua nhung » va nhung
cong vang » cong lang, cong quang, cong ngang
hoc hieu » hoc thieu, hoc hien, doc hieu
toan cao » toan tap
toan ban » van ban
hieu ca » hieu cac, hieu cua, hieu va

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 ca - ((minh hoang) or (canh tranh)) cua nhung cong vang ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu ca - ((minh hoang) OR (canh tranh)) cua nhung cong vang ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu ca - ((minh hoang) or (canh tranh)) cua nhung cong vang ((toan cao) or (toan ban))*.