Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
va thanh » gia thanh, ban thanh, va tinh
vien cac » vien bach, vien dai, vien da
su sach » so sach, vu sach
va hanh » van hanh, va danh, ban hanh
cac lop » cac hop, cac loai
nang xa » nang x, lang xa, nang ma
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
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: ((su sach) or (te sach)) ky nang xa hoi. hieu vien cac lop ((va hanh) OR (va thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky nang xa hoi. hieu vien cac lop ((va hanh) OR (va thanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) ky nang xa hoi. hieu vien cac lop ((va hanh) OR (va thanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky nang xa hoi. hieu vien cac lop ((va hanh) OR (va thanh)) vi cua tre*.