Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach ty » sach tu, sach thu, xach tay
hanh di » hanh vi, hanh de, hang di
sac van » cac van, san van, sat van
vu cham » vu kham, tu cham, qua cham
cua tre » cua te, cuu tre, cua triet
va cham » va chat, va tham
lang xa » lang ha, dang xay, lang van
di cua » dai cua, doi cua, de 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 ty) OR (sach y)) lang xa hoi. hieu ((va cham) or (vu cham)) sac van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ty) OR (sach y)) lang xa hoi. hieu ((va cham) OR (vu cham)) sac van hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ty) OR (sach y)) lang xa hoi. hieu ((va cham) or (vu cham)) sac van hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: so ((sach ty) OR (sach y)) lang xa hoi. hieu ((va cham) or (vu cham)) sac van hanh di cua tre*.