Perhaps you should try some spelling variations:
thuc dayt » thuc vat, thuc dan, thuc xay
sach thu » sach thue, sach thieu, sach tham
thuc day » thuc dan, thuc vat
hanh di » hanh vi, hanh de, hang di
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
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 thu) or (sai ky)) nang xa hoi. hieu ve cam ((thuc day) or (thuc dayt)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach thu) OR (sai ky)) nang xa hoi. hieu ve cam ((thuc day) OR (thuc dayt)) hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach thu) or (sai ky)) nang xa hoi. hieu ve cam ((thuc day) or (thuc dayt)) hanh di cua tre*.