Perhaps you should try some spelling variations:
hang cong » dang cong, hang nong, bang cong
theo dau » theo mau, thau dau, te dau
dau sach » cau sach, dat sach, hau sach
trung va » truong va, trang va, trung ha
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
tung va » tuong 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: theo dau sach - thanh ((tung va) or (trung va)) hang cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo dau sach - thanh ((tung va) OR (trung va)) hang cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: theo dau sach - thanh ((tung va) or (trung va)) hang cong dan toan cao*.