Perhaps you should try some spelling variations:
hanh lai » hanh lam, thanh lap, thanh loi
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
hanh tai » thanh tai, hang tai, hinh tai
sach tu » sach thu, cach tu, sach ty
han tai » hang tai, nhan tai, van tai
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
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 tu nang xa hoi. hieu van nam thuc va ((hanh lai) or (((hanh tai) or (han tai)))) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang xa hoi. hieu van nam thuc va ((hanh lai) OR (((hanh tai) OR (han tai)))) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang xa hoi. hieu van nam thuc va ((hanh lai) or (((hanh tai) or (han tai)))) cua tre*.