Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
cau tren » cu tren, ca tren, cau treo
danh di » danh du, danh dien, danh gia
xanh di » vanh dai, xanh tai
hieu ve » hieu va, hieu van
ve cac » va cac, vien 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 du va ((danh di) or (xanh di)) ((cau tren) OR (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sai ky nang o hoi. hieu ve cac du va ((danh di) OR (xanh di)) ((cau tren) OR (dau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sai ky nang o hoi. hieu ve cac du va ((danh di) or (xanh di)) ((cau tren) OR (dau tren))*".