Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hoc chieu » ho chieu, hoc hien, hoc dieu
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
tranh va » tranh van, trang va, trinh va
ban khan » ban than, ban nhan, ban chan
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chieu) or (hoc thieu)) sach - canh tranh va ((nhung cong) or (dung cong)) ban khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (hoc thieu)) sach - canh tranh va ((nhung cong) OR (dung cong)) ban khan cap.
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) or (hoc thieu)) sach - canh tranh va ((nhung cong) or (dung cong)) ban khan cap*.