Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
toc sach » hoc sach, doc sach, thuoc sach
sach thu » sach thue, sach thieu, sach tham
thu bang » thu ban, thu hang, chu bang
doanh va » doan va, doanh tai, doanh cua
cuu tre » cau tren, cau treo
suc van » su van, duc van, luc van
cao suc » cao su, cao duc
hieu va » lieu va
bang xa » lang xa, bang va, mang xa
cua tre » cua te, cua triet, dua tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach thu bang xa hoi. ((hieu va) or (hieu qua)) cao suc van doanh va ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thu bang xa hoi. ((hieu va) OR (hieu qua)) cao suc van doanh va ((cuu tre) OR (cua tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach thu bang xa hoi. ((hieu va) or (hieu qua)) cao suc van doanh va ((cuu tre) OR (cua tre))*".