Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu sach » chieu sach, hieu cach, hieu cac
dien sach » dien anh
tung pham » hung pham, nhung pham, trung phan
tung cam » dung cam, trung cap, duong cam
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu sach) or (dien sach)) - thanh ((tung cam) OR (tung pham)) nhung cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sach) OR (dien sach)) - thanh ((tung cam) OR (tung pham)) nhung cong san toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sach) or (dien sach)) - thanh ((tung cam) OR (tung pham)) nhung cong san toan cao".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) or (dien sach)) - thanh ((tung cam) OR (tung pham)) nhung cong san toan cao*.