Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
doanh ha » doanh va, doanh khoa, doanh nhan
te sach » toc sach
duc van » duc va, duc tan, duc manh
cuu tre » cua tre, cau tren, cau treo
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky danh
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
ha cuu » ho cuu, cham cuu, khao cuu

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 ((ky dang) OR (ky nang)) xay hoi. hieu ((ve cam) or (ve cac)) duc van doanh ha cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky dang) OR (ky nang)) xay hoi. hieu ((ve cam) OR (ve cac)) duc van doanh ha cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky dang) OR (ky nang)) xay hoi. hieu ((ve cam) or (ve cac)) duc van doanh ha cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky dang) OR (ky nang)) xay hoi. hieu ((ve cam) or (ve cac)) duc van doanh ha cuu tre*.