Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
danh dau » lanh dao, hang dau, danh tu
dap phoi » cap phoi, gap phoi, dap phap
cua tre » cua te, cuu tre, cua triet
dau cua » dai cua, day cua, cau cua
va danh » va dinh, va dan, va hanh
xuc va » duc va, tuc va, luc va
tu ban » thu ban, te ban
ky va » ke va, my va, ky la

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ban ((ky va) OR (ly va)) dap phoi. hieu ((va cac) or (vien cac)) xuc va danh dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ban ((ky va) OR (ly va)) dap phoi. hieu ((va cac) OR (vien cac)) xuc va danh dau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ban ((ky va) OR (ly va)) dap phoi. hieu ((va cac) or (vien cac)) xuc va danh dau cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ban ((ky va) OR (ly va)) dap phoi. hieu ((va cac) or (vien cac)) xuc va danh dau cua tre*.