Perhaps you should try some spelling variations:
danh dai » danh dau, danh di, danh sai
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van dan » van ban, van dao, van dau
ban dan » ban hang, ban hanh, ban quan
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet

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