Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
toc sach » hoc sach, doc sach, thuoc sach
vien cac » vien bach, vien dai, vien da
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
cac lop » cac hop, cac loai
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
lop va » lap va, hop va, nop va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (toc sach)) ky nang xa hoi. hieu vien cac lop va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (toc sach)) ky nang xa hoi. hieu vien cac lop va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (toc sach)) ky nang xa hoi. hieu vien cac lop va hanh vi cua tre*.