Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
doanh vai » doanh tai, doanh va, doanh giai
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
van hoi » van hoa, van hoc, van hoe
hieu ve » hieu va, hieu van
cam cuu » cham cuu, cap cuu
cuu san » cuu van, cua san, cuu ban
tu dan » tuc dan, tu ban, cu dan
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu dan ((ky tang) or (ky dang)) van hoi. hieu ve cam cuu san ((doanh vai) OR (doanh van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dan ((ky tang) OR (ky dang)) van hoi. hieu ve cam cuu san ((doanh vai) OR (doanh van)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu dan ((ky tang) or (ky dang)) van hoi. hieu ve cam cuu san ((doanh vai) OR (doanh van)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu dan ((ky tang) or (ky dang)) van hoi. hieu ve cam cuu san ((doanh vai) OR (doanh van)) cua tre*.