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

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) OR (duc mau)) tinh hai 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) OR (duc mau)) tinh hai 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) OR (duc mau)) tinh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((mai hoi) or (mai khoi)). hieu va cam ((duc may) OR (duc mau)) tinh hai cua tre*.