Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
va triet » va thiet, va trien, ve triet
mai khoi » mai khoa, tai khoa, cac khoi
dua ban » cua ban, qua ban, mua ban
te sach » toc sach
mai hoi » dai hoi, lai hoi, mai doi
hieu va » lieu va, hieu qua
va cham » va chat, va tham
y nang » ky nang, ly nang, v nang
hai va » hai van, thai va, hoi 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 y nang ((mai hoi) or (mai khoi)). hieu va cham ((dua ban) OR (dia ban)) thanh hai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((mai hoi) OR (mai khoi)). hieu va cham ((dua ban) OR (dia ban)) thanh hai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((mai hoi) or (mai khoi)). hieu va cham ((dua ban) OR (dia ban)) thanh hai va triet".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((mai hoi) or (mai khoi)). hieu va cham ((dua ban) OR (dia ban)) thanh hai va triet*.