Perhaps you should try some spelling variations:
vien cac » vien dai, vien da, gian cac
thuc day » thuc dan, thuc vat
day dang » da dang, dai dang, day dan
dang do » nang doc, dang duc, dung doi
cua tre » cua te, cuu tre, cua triet
vu sai » vu hai, vu san, vu dai
sai ky » sac ky
do cua » doi cua, co cua, de cua
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu ((vien cac) OR (vien bach)) thuc day dang do cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sai ky nang x hoi. hieu ((vien cac) OR (vien bach)) thuc day dang do cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sai ky nang x hoi. hieu ((vien cac) OR (vien bach)) thuc day dang do cua tre*.