Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
thuong va » truong va, thong va, thuong mai
thuoc va » thuc va, thuoc ma, thuoc tai
hieu van » hieu va, thien van, lieu va
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
van lam » van nam
ky lang » ky dang, ky tang, tay lang
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ((ky lang) or (ky nang)) xa hoi. hieu van lam ((thuoc va) OR (thuong va)) doanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ((ky lang) OR (ky nang)) xa hoi. hieu van lam ((thuoc va) OR (thuong va)) doanh van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ((ky lang) or (ky nang)) xa hoi. hieu van lam ((thuoc va) OR (thuong va)) doanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ((ky lang) or (ky nang)) xa hoi. hieu van lam ((thuoc va) OR (thuong va)) doanh van cua tre*.