Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
duc manh » suc manh, duc anh, duc minh
hanh vai » hanh vi, hanh va, hanh tai
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
duc van » duc va, duc tan, duc phan
han tai » hang tai, nhan tai, van tai
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 ((duc van) OR (duc manh)) ((hanh vai) or (han 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 ((duc van) OR (duc manh)) ((hanh vai) OR (han tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoa. hieu van nam ((duc van) OR (duc manh)) ((hanh vai) or (han tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoa. hieu van nam ((duc van) OR (duc manh)) ((hanh vai) or (han tai)) cua tre*.