Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
hanh hoi » hanh thoi, hanh noi, hanh hoa
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
sang xa » song xa, lang xa, sang ma
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
ve cac » va cac
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
tu sac » tu sach, tu cac, tu san

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 sang xa hoi. hieu ((ve cac) OR (vien cac)) ((xuc va) or (tuc va)) hanh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang xa hoi. hieu ((ve cac) OR (vien cac)) ((xuc va) OR (tuc va)) hanh hoi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky sang xa hoi. hieu ((ve cac) OR (vien cac)) ((xuc va) or (tuc va)) hanh hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang xa hoi. hieu ((ve cac) OR (vien cac)) ((xuc va) or (tuc va)) hanh hoi cua tre*.