Perhaps you should try some spelling variations:
cao thuc » cao thuoc, bao thuc, can thuc
hanh vai » hanh vi, hanh tai, hanh van
sach ha » sach han, sach xa, bach ha
hanh va » hang va, hanh vi
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao

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 ha) OR (sach nha)) nang xa hoi. hieu va cao thuc va ((hanh vai) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ha) OR (sach nha)) nang xa hoi. hieu va cao thuc va ((hanh vai) OR (hanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ha) OR (sach nha)) nang xa hoi. hieu va cao thuc va ((hanh vai) or (hanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ha) OR (sach nha)) nang xa hoi. hieu va cao thuc va ((hanh vai) or (hanh va)) cua tre*.