Perhaps you should try some spelling variations:
duc thuan » duc tan, duc thang, duc phan
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
anh vi » hanh vi, anh ve, anh vu
anh va » hanh va
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: te sach ky nang x hoi. ((hieu ve) or (lieu va)) cam duc thuan ((anh vi) OR (anh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. ((hieu ve) OR (lieu va)) cam duc thuan ((anh vi) OR (anh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. ((hieu ve) or (lieu va)) cam duc thuan ((anh vi) OR (anh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. ((hieu ve) or (lieu va)) cam duc thuan ((anh vi) OR (anh va)) cua tre*.