Perhaps you should try some spelling variations:
doanh vai » doanh tai, doanh van, doanh giai
doanh va » doan va, doanh tai, doanh cua
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
van hoe » van hoa, van hoc, van hieu
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 hoe. hieu ve cam cuu san ((doanh vai) OR (doanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dan ((ky tang) OR (ky dang)) van hoe. hieu ve cam cuu san ((doanh vai) OR (doanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu dan ((ky tang) or (ky dang)) van hoe. hieu ve cam cuu san ((doanh vai) OR (doanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu dan ((ky tang) or (ky dang)) van hoe. hieu ve cam cuu san ((doanh vai) OR (doanh va)) cua tre*.