Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
sach thu » sach thue, sach thieu, sach tham
hanh vai » hanh vi, hanh va, hanh tai
han tai » hang tai, nhan tai, van tai
thuc va » thuc vat, thuc dan, thuc day
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
sach tu » cach tu, sach ty, 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 thu) or (sach tu)) lang xa hoi. hieu ve cham thuc va ((hanh vai) or (han tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach tu)) lang xa hoi. hieu ve cham thuc va ((hanh vai) OR (han tai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) or (sach tu)) lang xa hoi. hieu ve cham thuc va ((hanh vai) or (han tai)) cua tre*.