Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
hanh van » thanh van, khanh van, hanh san
doi nang » dai nang, hoi nang, voi nang
hieu van » hieu va, thien van, lieu va
van nham » van nam, van nhan, van tham
sach doi » sach hoi, sach moi, sach dao
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
hanh va » hang va, hanh vi
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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 doi nang x hoi. hieu van nham thuc va ((((hanh van) or (hanh tai))) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi nang x hoi. hieu van nham thuc va ((((hanh van) OR (hanh tai))) OR (hanh va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach doi nang x hoi. hieu van nham thuc va ((((hanh van) or (hanh tai))) or (hanh va)) cua tre*.