Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
toc sach » hoc sach, doc sach, thuoc sach
danh van » dang van, dinh van, anh van
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
qua cac » cua cac
danh vi » hanh vi, dinh vi, danh va
danh di » danh du, xanh di, danh dien
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y ((danh van) or (doanh van)) hoi. hieu qua cac nuoc va ((danh vi) OR (danh di)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((danh van) OR (doanh van)) hoi. hieu qua cac nuoc va ((danh vi) OR (danh di)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y ((danh van) or (doanh van)) hoi. hieu qua cac nuoc va ((danh vi) OR (danh di)) cua tu".
• Adding a wildcard symbol may retrieve word variants: toc sach y ((danh van) or (doanh van)) hoi. hieu qua cac nuoc va ((danh vi) OR (danh di)) cua tu*.