Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
dang hoi » dang khoi, dang hoai, dong hoi
nang xa » nang x, lang xa, nang ma
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
lo va » lo van, lao va, le va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang xa hoi. hieu ((dien hoa) or (vien cac)) ((lo va) or (ly va)) dang hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. hieu ((dien hoa) OR (vien cac)) ((lo va) OR (ly va)) dang hoi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu ((dien hoa) or (vien cac)) ((lo va) or (ly va)) dang hoi cua tre*.