Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
manh hai » lanh hai, minh hai, thanh hai
anh hai » lanh hai, anh thai, anh bai
xuc ban » duc ban, cuc ban, quoc ban
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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 ty nang xa hoi. hieu ((ve cam) or (vien cac)) xuc ban ((anh hai) or (manh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu ((ve cam) OR (vien cac)) xuc ban ((anh hai) OR (manh hai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ((ve cam) or (vien cac)) xuc ban ((anh hai) or (manh hai)) cua tre*.