Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
danh van » dang van, dinh van, anh van
tu sach » thu sach, su sach, te sach
vu cham » va cham, vu kham, tu cham
sach ky » sac ky, sach y, sach ty
ve chat » va chat, van chat
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
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 ky nang xa hoi. hieu ((ve chat) or (vu cham)) tuc va ((danh van) OR (doanh van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((ve chat) OR (vu cham)) tuc va ((danh van) OR (doanh van)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ((ve chat) or (vu cham)) tuc va ((danh van) OR (doanh van)) cua tre*".