Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
hoc chinh » hoan chinh, hoc sinh, hoc kinh
hang cong » dang cong, hang nong, bang cong
ban thanh » ban hanh, ban hang
ho chinh » cho chinh, hoa chinh, do chinh
tranh va » tranh van, trang va, trinh va
dan ban » van ban, can ban, dan ba

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chinh) OR (hoc chinh)) sach - canh tranh va ((nhung cong) or (hang cong)) dan ban thanh~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chinh) OR (hoc chinh)) sach - canh tranh va ((nhung cong) OR (hang cong)) dan ban thanh.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chinh) OR (hoc chinh)) sach - canh tranh va ((nhung cong) or (hang cong)) dan ban thanh".
• Adding a wildcard symbol may retrieve word variants: ((ho chinh) OR (hoc chinh)) sach - canh tranh va ((nhung cong) or (hang cong)) dan ban thanh*.