Perhaps you should try some spelling variations:
sach ky » sach y, sach ty, sach kem
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
di cua » dai cua, doi cua, de cua
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sac ky)) nang xa hoi. hieu ve cac duc ((va hanh) OR (va danh)) di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sac ky)) nang xa hoi. hieu ve cac duc ((va hanh) OR (va danh)) di cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sac ky)) nang xa hoi. hieu ve cac duc ((va hanh) OR (va danh)) di cua tre*.