Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
sach thu » sach thue, sach thieu, sach tham
va doanh » van doanh, vay doanh, va danh
hieu van » thien van, lieu va, hieu ve
su sach » so sach, vu sach
van cuu » van cau, van chu, van cu
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
xuc va » duc va, tuc va, luc va

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

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