Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
va doanh » van doanh, vay doanh, va danh
van cua » vang cua, ban cua, dan cua
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach y, sach vay
soc va » hoc va, loc va, doc va
sach 2 » sach y

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 v) OR (sach 2)) nang xa hoi. ((hieu ve) or (hieu va)) cham soc va doanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach v) OR (sach 2)) nang xa hoi. ((hieu ve) OR (hieu va)) cham soc va doanh van cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach v) OR (sach 2)) nang xa hoi. ((hieu ve) or (hieu va)) cham soc va doanh van cua tre*".