Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
sinh sach » chinh sach, sinh san, sinh danh
sang sach » mang sach, ban sach, sang tac
tuong va » truong va, thuong va, luong va
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cao » toan ban, toan tap
tung va » trung va, dung va, vung va

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