Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
cua tre » cua te, cuu tre, cua triet
dan dai » dat dai, can dai, dan dat
ban dan » ban hang, ban hanh, ban quan
cuu ban » cuu van, cua ban, cuu san
ve cham » va cham, ve chat, vu cham
van hoi » van hoc, van hoe, van loi
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
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 lang ((van hoi) or (van hoa)). hieu ((ve cham) or (vien cac)) cuu ban dan dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky lang ((van hoi) OR (van hoa)). hieu ((ve cham) OR (vien cac)) cuu ban dan dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky lang ((van hoi) or (van hoa)). hieu ((ve cham) or (vien cac)) cuu ban dan dai cua tre*.