Perhaps you should try some spelling variations:
van doanh » toan doanh, van thanh, van anh
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
cao suc » cao su, cao duc
van cuu » van cau, van chu, van cu
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 dong)) 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 dong)) van cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu nang xa hoi. ((hieu va) or (hieu qua)) cao suc ((van doanh) OR (van dong)) van cuu tre*".