Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
sai ky » sac 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 (sai ky)) nang xa hoi. ((hieu van) OR (thien 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 (sai ky)) nang xa hoi. ((hieu van) OR (thien 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 (sai ky)) nang xa hoi. ((hieu van) OR (thien van)) pham duc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sai ky)) nang xa hoi. ((hieu van) OR (thien van)) pham duc va hanh vi cua tre*.