Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
xuc van » duc van, luc van, vuc van
vu kham » vu khanh
vu cham » va cham, tu cham, qua cham
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: vu sach ky ((nang xa) or (lang xa)) hoi. hieu ((vu cham) OR (vu kham)) xuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((nang xa) OR (lang xa)) hoi. hieu ((vu cham) OR (vu kham)) xuc van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky ((nang xa) or (lang xa)) hoi. hieu ((vu cham) OR (vu kham)) xuc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((nang xa) or (lang xa)) hoi. hieu ((vu cham) OR (vu kham)) xuc van hanh vi cua tre*.