Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van anh
van thanh » ban thanh, van tuan
thu nang » thi nang, thu hang, thu bang
sach thu » sach thue, sach thieu, sach tham
te sach » toc sach
van cuu » van cau, van chu, van cu
cao suc » cao su, cao duc
hieu va » lieu va
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thu nang xa hoi. ((hieu va) or (hieu qua)) cao suc ((van doanh) or (van thanh)) van cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang xa hoi. ((hieu va) OR (hieu qua)) cao suc ((van doanh) OR (van thanh)) van cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sach thu nang xa hoi. ((hieu va) or (hieu qua)) cao suc ((van doanh) or (van thanh)) van cuu tre*.