Perhaps you should try some spelling variations:
doanh ban » doanh bat, doanh van, doanh nhan
danh vai » danh sai, danh va, doanh van
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
sach ta » sach tai, sach xa, sach ha
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
tang ha » lang ha, tang ma, trung ha
ta tang » ta trang, tay tang, ha tang
ha hoi » hoa hoi, ha noi, xa hoi
tuc va » thuc va, truc va, duc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ta tang ha hoi. hieu ve cham ((tuc va) OR (tuc xa)) ((danh vai) or (doanh ban)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ta tang ha hoi. hieu ve cham ((tuc va) OR (tuc xa)) ((danh vai) OR (doanh ban)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ta tang ha hoi. hieu ve cham ((tuc va) OR (tuc xa)) ((danh vai) or (doanh ban)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ta tang ha hoi. hieu ve cham ((tuc va) OR (tuc xa)) ((danh vai) or (doanh ban)) cua tre*.