Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
thuc van » thuc vat, thuc dan, thuc va
nhan tai » hang tai, van tai, toan tai
han tai » hang tai, van tai, toan tai
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
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: te sach ky nang ma hoa. hieu van nam thuc van ((hanh vai) or (((han tai) or (nhan tai)))) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoa. hieu van nam thuc van ((hanh vai) OR (((han tai) OR (nhan tai)))) cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoa. hieu van nam thuc van ((hanh vai) or (((han tai) or (nhan tai)))) cua tre*.