Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc chiet » hoc thiet, hoc hien, hoc viet
hoc nhiet » hoc thiet, hoc nghien, hoc hien
cong bang » cuong bang, dong bang, hong bang
bang than » bang thanh, ban than, sang than
tranh va » tranh van, trang va, trinh va
than ban » thanh ban, toan ban, than man

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chiet) OR (hoc nhiet)) tach - canh tranh va nhung cong bang than ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chiet) OR (hoc nhiet)) tach - canh tranh va nhung cong bang than ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc chiet) OR (hoc nhiet)) tach - canh tranh va nhung cong bang than ban*.