Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hanh tri » thanh tri, hanh tai, hanh triet
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ky » sac ky, sach y, sach ty
lam xuc » cam xuc, lam duoc
van lam » van nam
nang ma » tang ma, sang ma, mang may
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

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) OR (nang cao)) hoa. hieu van lam xuc va ((hanh tri) or (hanh trinh)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang ma) OR (nang cao)) hoa. hieu van lam xuc va ((hanh tri) OR (hanh trinh)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang ma) OR (nang cao)) hoa. hieu van lam xuc va ((hanh tri) or (hanh trinh)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang ma) OR (nang cao)) hoa. hieu van lam xuc va ((hanh tri) or (hanh trinh)) cua tre*.