Perhaps you should try some spelling variations:
danh doi » danh di, thanh doi, dung doi
thuc day » thuc dan, thuc vat
sach ky » sac ky, sach y, sach ty
doi cua » dai cua, hoi cua
thuc va » thuc vat, thuc dan
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
sai ky » sac ky

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