Perhaps you should try some spelling variations:
sach truc » cach thuc, sach tren, sach thu
hieu van » hieu va, thien van, lieu va
hanh dai » hanh tai, vanh dai, thanh dat
hanh dao » lanh dao, thanh dat, thanh dam
tu sach » thu sach, su sach, te sach
nano xa » nano va, nano bac, nano cau
van lam » van nam
lam xuc » cam xuc, lam duoc
xuc ban » duc ban, cuc ban, quoc ban
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 truc nano xa hoi. hieu van lam xuc ban ((hanh dai) or (hanh dao)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach truc nano xa hoi. hieu van lam xuc ban ((hanh dai) OR (hanh dao)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach truc nano xa hoi. hieu van lam xuc ban ((hanh dai) or (hanh dao)) cua tre*.