Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
bao xuc » bao luc, bao thuc
van bao » van ban, van dao
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ky) or (sach y)) nang xa hoi. hieu van bao xuc ((va hanh) OR (va danh)) tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sach y)) nang xa hoi. hieu van bao xuc ((va hanh) OR (va danh)) tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ky) or (sach y)) nang xa hoi. hieu van bao xuc ((va hanh) OR (va danh)) tri cua tre".
• Adding a wildcard symbol may retrieve word variants: so ((sach ky) or (sach y)) nang xa hoi. hieu van bao xuc ((va hanh) OR (va danh)) tri cua tre*.