Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
vay doanh » van doanh, ly doanh, voi doanh
cham cuu » cap cuu, chat cua
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
van cua » vang cua, ban cua, dan cua
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet

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