Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
va hanh » van hanh, va thanh, va danh
dai xuc » dai xu, dai luoc, dai thuc
sach ky » sac ky, sach ty, sach kem
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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 ky) OR (sach y)) nang x hoi. hieu vien dai xuc ((va hanh) or (gia thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ky) OR (sach y)) nang x hoi. hieu vien dai xuc ((va hanh) OR (gia thanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ky) OR (sach y)) nang x hoi. hieu vien dai xuc ((va hanh) or (gia thanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ky) OR (sach y)) nang x hoi. hieu vien dai xuc ((va hanh) or (gia thanh)) vi cua tre*.