Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
vien cac » vien bach, vien dai, vien da
va dinh » van dinh, va kinh, va tinh
dinh di » dinh du, dinh vi, danh di
cuu tre » cua tre, cau treo
nang o » nang co, nang ho, nang ro
ve cac » va cac
sac ky » cac ky, sai ky
vu sac » vu sach, vu san, va sac
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 sac ky nang o hoi. hieu ((ve cac) or (vien cac)) tu va dinh di ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang o hoi. hieu ((ve cac) OR (vien cac)) tu va dinh di ((cuu tre) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang o hoi. hieu ((ve cac) or (vien cac)) tu va dinh di ((cuu tre) OR (cau tren))*".