Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
tieu sach » chieu sach, dien sach, te sach
hang cong » dang cong, hang nong, bang cong
chinh va » chinh ta, chinh tai, hanh va
toan cao » toan ban
toan tap » toan ban
va hang » van hang, va nang, va lang

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 - hanh chinh va hang cong thanh ((toan cao) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - hanh chinh va hang cong thanh ((toan cao) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh chinh va hang cong thanh ((toan cao) OR (toan tap))*.