Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc chieu » ho chieu, hoc dieu, hoc thiet
hoc thieu » toc thieu
tranh va » tranh van, trang va, trinh va
cong san » cong tac
san toan » van toan, dan toan, 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 chieu) or (((hoc thieu) OR (hoc hien)))) tinh - canh tranh va nhung cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (((hoc thieu) OR (hoc hien)))) tinh - canh tranh va nhung cong san toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) or (((hoc thieu) OR (hoc hien)))) tinh - canh tranh va nhung cong san toan ban*".