Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
sinh sach » chinh sach, sinh san, sang sach
doanh cao » doanh co, doanh bao, doanh cho
tuong va » truong va, thuong va, duong va
luong va » dung va
cong tap » cuong tap, cong tac, cong tan
doan cao » toan cao, doan cap, hoang cao

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

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