Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
ve cao » ve bao, ve cac, ve co
va cao » va cac, va co, va dao

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

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