Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
hanh lam » thanh lap, hanh kem, hanh va
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
lam cua » nam cua, lam chat
vuc van » duc van, luc van, thuc van
cua tre » cua te, cuu tre, cua triet
sach 2 » sach y
ma hoi » mai hoi, ma hoa, me hoi
2 nang » v nang
ve cac » va cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach 2 nang ((ma hoi) or (xa hoi)). hieu ((ve cac) or (vien cac)) vuc van hanh lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach 2 nang ((ma hoi) OR (xa hoi)). hieu ((ve cac) OR (vien cac)) vuc van hanh lam cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach 2 nang ((ma hoi) or (xa hoi)). hieu ((ve cac) or (vien cac)) vuc van hanh lam cua tre*.