Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
hanh vai » hanh va, hanh tai, hanh van
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach thu, xach tay
ve nham » ve nha, ve cham
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
sach tu » sach thu, cach tu, sach uu
cua tre » cua te, cuu tre, cua triet

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