Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc chiet » hoc thiet, hoc nhiet, hoc viet
cong bang » cuong bang, dong bang, hong bang
thanh ban » thanh san, thanh van, thanh bac
tranh va » tranh van, trang va, trinh va
than ban » toan ban, than man, nhuan 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 chiet) OR (hoc hien)) tach - canh tranh va nhung cong bang ((than ban) or (thanh ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chiet) OR (hoc hien)) tach - canh tranh va nhung cong bang ((than ban) OR (thanh ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chiet) OR (hoc hien)) tach - canh tranh va nhung cong bang ((than ban) or (thanh ban))".
• Adding a wildcard symbol may retrieve word variants: ((hoc chiet) OR (hoc hien)) tach - canh tranh va nhung cong bang ((than ban) or (thanh ban))*.