Perhaps you should try some spelling variations:
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
vu cham » va cham, vu kham, tu cham
hanh di » hanh vi, hanh de, hang di
sac van » cac van, san van, sat van
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
ve cham » va cham, ve chat, ve chim
xay hoi » xa hoi, tay hoi, cay phoi
ty dang » ty xang, ky dang, ty hang
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: su sach ty dang xay hoi. hieu ((ve cham) or (vu cham)) sac van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty dang xay hoi. hieu ((ve cham) OR (vu cham)) sac van hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty dang xay hoi. hieu ((ve cham) or (vu cham)) sac van hanh di cua tre*.