Perhaps you should try some spelling variations:
hang tai » hang va, dung tai
sach thu » sach thue, sach thieu, sach tham
cau thuc » cau truc, cuu thuc, can thuc
tai cua » thai cua, tai cuc, tri cua
va hang » van hang, va nang, va lang
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
sach tu » cach tu, sach ty, sach uu
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma

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

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