Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
cham tuc » nham thuc, pham thuc, tham thuc
trang va » hang va
tran van » luan van
danh vai » danh sai, danh va, dang van
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
tuc va » thuc va, truc va, tuc xa

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

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