Perhaps you should try some spelling variations:
tinh hai » tinh thai, trinh han, thanh hai
mai khoi » mai khoa, tai khoa, cac khoi
te sach » toc sach
cam duc » cam xuc, cao duc, pham duc
duc may » duc mau, duc man, duc manh
hieu va » lieu va, hieu qua
mai hoi » dai hoi, lai hoi, mai doi
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
y nang » ky nang, ly nang, v nang

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 y nang ((mai hoi) or (mai khoi)). hieu va cam duc may ((tinh hai) OR (tinh chat)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((mai hoi) OR (mai khoi)). hieu va cam duc may ((tinh hai) OR (tinh chat)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((mai hoi) or (mai khoi)). hieu va cam duc may ((tinh hai) OR (tinh chat)) cua tre*".