Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
xuc van » duc van, luc van, xuc ban
va cham » va chat, va tham
ve cham » ve chat, vu cham, ve chim
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
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: so sach ky ((nang xa) or (lang xa)) hoi. hieu ((ve cham) OR (va cham)) xuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((nang xa) OR (lang xa)) hoi. hieu ((ve cham) OR (va cham)) xuc van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((nang xa) or (lang xa)) hoi. hieu ((ve cham) OR (va cham)) xuc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky ((nang xa) or (lang xa)) hoi. hieu ((ve cham) OR (va cham)) xuc van hanh vi cua tre*.