Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te sach
tung cong » dung cong, tong cong, truong cong
anh tang » anh bang, anh dang, anh nang
tang duy » tang du, tang quy, tung duy
duy tung » duy tuong, duc tung, duy dung
cong tan » cong tac, cong san, cong thanh
toan cau » toan ban, toan tap, toan tai
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: theo tieu sach - anh tang duy tung cong tan ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - anh tang duy tung cong tan ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - anh tang duy tung cong tan ((toan cau) or (toan cao))*.