Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
xanh di » vanh dai, xanh tai
danh di » danh du, danh dien, danh gia
cuu tre » cua tre, cau tren, cau treo
ve cac » va cac
sai ky » sac ky
nang o » nang co, nang ho, nang ro
vu sai » vu hai, vu san, vu dai
du va » dau va, tu va, su va
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sai ky nang o hoi. hieu ((ve cac) OR (vien cac)) du va ((danh di) or (xanh di)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sai ky nang o hoi. hieu ((ve cac) OR (vien cac)) du va ((danh di) OR (xanh di)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sai ky nang o hoi. hieu ((ve cac) OR (vien cac)) du va ((danh di) or (xanh di)) cuu tre*".