Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky
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: tu ((((sach ky) OR (sac ky))) or (sai ky)) nang xa hoi. hieu van pham duc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((((sach ky) OR (sac ky))) OR (sai ky)) nang xa hoi. hieu van pham duc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((((sach ky) OR (sac ky))) or (sai ky)) nang xa hoi. hieu van pham duc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((((sach ky) OR (sac ky))) or (sai ky)) nang xa hoi. hieu van pham duc va hanh vi cua tre*.