Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
hieu van » hieu va, thien van, lieu va
van hang » van khang, van hoang, van thang
thuc van » thuc vat, thuc dan, thuc va
cau thuc » cau truc, cuu thuc, can thuc
hang vi » hang va, hanh vi, hang di
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
vi cua » vai cua, di cua

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

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